Bdtjtk

I need to fix the borders on my header table, on chrome, the top border disappears when I scroll down, and on firefox, it simply does not appears.

You can see it here https://codepen.io/anon/pen/zyEwZq#anon-login

And open on both browsers to check it out.

I've tried to use others position, like fixed, but it didn't work.

<div id="dados-ordem-tabela" class="alphaBorda1 settingsConf shadow-box ativa-display-dialog">

<div class="titulo alphaBackground3">

    <a>Dados de Ordem</a>

</div>

<div class="menuSt">

    <ul class="settingsConf-ul">

        <li id="aba-dados-ordem" tab=".dados-ordem" class="mouseoverAlpha5 settingsConf-li tippy-cursor-point pri aq">Ordens</li>

        <li id="aba-dados-ordem-oms" tab=".dados-ordem-oms" class="mouseoverAlpha5 settingsConf-li tippy-cursor-point pri">Stop</li>

    </ul>

</div>

<div class="dados-ordem style-tabela style-tabela-ordens menuBck" style="">

    <table>

        <thead class="cor-fundo-principal">

            <tr>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="CANCELAR">CANCELAR</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="C/V">C/V</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="PAPEL">PAPEL</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="QTD.">QTD.</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="PREÇO">PREÇO</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="STATUS">STATUS <span class="mouseoverAlpha5 icon-imgIntervalo"></span></th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="QTD. EX.">QTD. EX.</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="PRÇ. MED.">PRÇ. MED.</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="ORIGEM">ORIGEM</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="DATA DE ENVIO">DATA DE ENVIO</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="TIPO">TIPO</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="VALIDADE">VALIDADE</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="CÓD. CLI.">CÓD. CLI.</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="ULT. ALT.">ULT. ALT.</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="QTD. APARENTE">QTD. APARENTE</th>

                <th class="cor-fundo-principal alphaborda1" valuetocsv="SALDO">SALDO</th>

            </tr>

        </thead>

        <tbody>

            <tr class="alphaBackground3" style="background-color: rgba(0, 240, 120, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073684' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073684"></span></td>

                <td valuetocsv="C" class="text-center CV">C</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.055,00" class="text-right">87.055,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:28" class="">28/12/2018 11:30:28</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:28:117" class="">11:30:28:117</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>

            <tr class="alphaBackground5" style="background-color: rgba(0, 240, 120, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073683' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073683"></span></td>

                <td valuetocsv="C" class="text-center CV">C</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.080,00" class="text-right">87.080,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:27" class="">28/12/2018 11:30:27</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:27:970" class="">11:30:27:970</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>

            <tr class="alphaBackground3" style="background-color: rgba(0, 240, 120, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073682' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073682"></span></td>

                <td valuetocsv="C" class="text-center CV">C</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.135,00" class="text-right">87.135,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:27" class="">28/12/2018 11:30:27</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:27:830" class="">11:30:27:830</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>

            <tr class="alphaBackground5" style="background-color: rgba(0, 240, 120, 0.05);">

                <td valuetocsv="-" class="text-center"> - </td>

                <td valuetocsv="C" class="text-center CV">C</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.205,00" class="text-right">87.205,00</td>

                <td valuetocsv="<span class='executada'>Executada</span>" class="text-left"><span class="executada">Executada</span></td>

                <td valuetocsv="1" class="">1</td>

                <td valuetocsv="87.205,0000" class="">87.205,0000</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:27" class="">28/12/2018 11:30:27</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:36:34:917" class="">11:36:34:917</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="0" class="">0</td>

            </tr>

            <tr class="alphaBackground3" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="-" class="text-center"> - </td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.290,00" class="text-right">87.290,00</td>

                <td valuetocsv="<span class='executada'>Executada</span>" class="text-left"><span class="executada">Executada</span></td>

                <td valuetocsv="1" class="">1</td>

                <td valuetocsv="87.305,0000" class="">87.305,0000</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:27" class="">28/12/2018 11:30:27</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:28:300" class="">11:30:28:300</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="0" class="">0</td>

            </tr>

            <tr class="alphaBackground5" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="-" class="text-center"> - </td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.335,00" class="text-right">87.335,00</td>

                <td valuetocsv="<span class='executada'>Executada</span>" class="text-left"><span class="executada">Executada</span></td>

                <td valuetocsv="1" class="">1</td>

                <td valuetocsv="87.335,0000" class="">87.335,0000</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:27" class="">28/12/2018 11:30:27</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:49:663" class="">11:30:49:663</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="0" class="">0</td>

            </tr>

            <tr class="alphaBackground3" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="-" class="text-center"> - </td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.320,00" class="text-right">87.320,00</td>

                <td valuetocsv="<span class='executada'>Executada</span>" class="text-left"><span class="executada">Executada</span></td>

                <td valuetocsv="1" class="">1</td>

                <td valuetocsv="87.320,0000" class="">87.320,0000</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:27" class="">28/12/2018 11:30:27</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:34:423" class="">11:30:34:423</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="0" class="">0</td>

            </tr>

            <tr class="alphaBackground5" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="-" class="text-center"> - </td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.290,00" class="text-right">87.290,00</td>

                <td valuetocsv="<span class='executada'>Executada</span>" class="text-left"><span class="executada">Executada</span></td>

                <td valuetocsv="1" class="">1</td>

                <td valuetocsv="87.305,0000" class="">87.305,0000</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:27" class="">28/12/2018 11:30:27</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:28:300" class="">11:30:28:300</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="0" class="">0</td>

            </tr>

            <tr class="alphaBackground3" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="-" class="text-center"> - </td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.240,00" class="text-right">87.240,00</td>

                <td valuetocsv="<span class='executada'>Executada</span>" class="text-left"><span class="executada">Executada</span></td>

                <td valuetocsv="1" class="">1</td>

                <td valuetocsv="87.255,0000" class="">87.255,0000</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:26" class="">28/12/2018 11:30:26</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:35:35:683" class="">11:35:35:683</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="0" class="">0</td>

            </tr>

            <tr class="alphaBackground5" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="-" class="text-center"> - </td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.185,00" class="text-right">87.185,00</td>

                <td valuetocsv="<span class='executada'>Executada</span>" class="text-left"><span class="executada">Executada</span></td>

                <td valuetocsv="1" class="">1</td>

                <td valuetocsv="87.205,0000" class="">87.205,0000</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:26" class="">28/12/2018 11:30:26</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:41:48:920" class="">11:41:48:920</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="0" class="">0</td>

            </tr>

            <tr class="alphaBackground3" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073674' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073674"></span></td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.140,00" class="text-right">87.140,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:26" class="">28/12/2018 11:30:26</td>

                <td valuetocsv="STP" class="text-center">STP</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:26:583" class="">11:30:26:583</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>

            <tr class="alphaBackground5" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073673' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073673"></span></td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.110,00" class="text-right">87.110,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:26" class="">28/12/2018 11:30:26</td>

                <td valuetocsv="STP" class="text-center">STP</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:26:517" class="">11:30:26:517</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>

            <tr class="alphaBackground3" style="background-color: rgba(252, 83, 83, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073672' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073672"></span></td>

                <td valuetocsv="V" class="text-center CV">V</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="87.055,00" class="text-right">87.055,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:26" class="">28/12/2018 11:30:26</td>

                <td valuetocsv="STP" class="text-center">STP</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:26:300" class="">11:30:26:300</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>

            <tr class="alphaBackground5" style="background-color: rgba(0, 240, 120, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073671' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073671"></span></td>

                <td valuetocsv="C" class="text-center CV">C</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="86.950,00" class="text-right">86.950,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:26" class="">28/12/2018 11:30:26</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:26:210" class="">11:30:26:210</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>

            <tr class="alphaBackground3" style="background-color: rgba(0, 240, 120, 0.05);">

                <td valuetocsv="<span class='mouseoverAlpha5 icon-imgRemove cancela-ordem' value='4073670' ></span>"

                    class="text-center"><span class="mouseoverAlpha5 icon-imgRemove cancela-ordem" value="4073670"></span></td>

                <td valuetocsv="C" class="text-center CV">C</td>

                <td valuetocsv="WING19" class="text-center">WING19</td>

                <td valuetocsv="1" class="text-right">1</td>

                <td valuetocsv="86.945,00" class="text-right">86.945,00</td>

                <td valuetocsv="<span class='aberto'>Aberto</span>" class="text-left"><span class="aberto">Aberto</span></td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="0" class="">0</td>

                <td valuetocsv="WEB" class="text-center">WEB</td>

                <td valuetocsv="28/12/2018 11:30:26" class="">28/12/2018 11:30:26</td>

                <td valuetocsv="DIA" class="text-center">DIA</td>

                <td valuetocsv="28/12/2018" class="">28/12/2018</td>

                <td valuetocsv="7332" class="">7332</td>

                <td valuetocsv="11:30:26:010" class="">11:30:26:010</td>

                <td valuetocsv="-" class=""> - </td>

                <td valuetocsv="1" class="">1</td>

            </tr>











        </tbody>

    </table>

</div>



<div class="footer">

    <button class="alphaBackground3 alphaBorda1 button bt-atualizar" type="button">Atualizar</button>

    <button class="alphaBackground3 alphaBorda1 button bt-cancelar" type="button">Fechar</button>

</div>

CSS

html, body .tippy-tooltip.menu-list-theme, .cor-fundo-principal, .sub-menu, .text-object, .include-indicator-manager, .ui-widget-content, .auth-content, .input-dialog, .settingsConf, .jQWCP-wWidget, .popover, .clockpicker-button, .txt-edit-quantidade-chart-trading, .dialog-long-click, .chart-txt, .tooltip-listas, .bts-compra-venda-mobile, .dialog-edit-stop-de-posicao {

background: #333333;

 }



.shadow-box {

box-shadow: 0px 0px 30px #000;

}



.ativa-display-dialog {

display: block;

}



.settingsConf {

height: 75%;

float: left;

width: 80%;

top: 5%;

left: 10%;

position: absolute;

border-top: none;

border-radius: 0;

z-index: 99;

}



  :not(input):not(textarea) {

-webkit-user-select: none;

-webkit-touch-callout: none;

}



a, span, div, input[type="button"], button, label, .clockpicker-tick, .btn-default, .input-lista-dinamica-layouts, .boleta-ajuste-input {

color: #fff;

}



 .settingsConf .titulo {

border-radius: 0;

width: 100%;

padding: 8px 0;

}



.alphaBackground3, table > tbody > tr:nth-child(2n) {

background: rgba(77, 77, 77, 1);

}



.titulo a {

margin-left: 5px;

}



.menuSt {

border-bottom: 1px solid #ccc;

overflow-x: auto;

}



.settingsConf-ul {

height: 43px;

white-space: nowrap;

}



ul, li {

margin: 0px;

padding: 0px;

list-style: none;

}



.settingsConf .menuSt ul li.pri {

padding-right: 10px;

padding-left: 10px;

}



.settingsConf .menuSt ul li.aq {

border-bottom: 3px solid #67CAD4;

}



.settingsConf-li {

font-size: 15px;

list-style-type: none;

padding: 10px 0 10px;

    padding-right: 0px;

    padding-left: 0px;

display: inline-block;

position: relative;

}



.settingsConf .menuSt ul li.aq {

border-bottom: 3px solid #67CAD4;

}



.style-tabela-ordens {

height: calc(100% - 125px);

}



.style-tabela {

display: block;

margin: 10px 10px 10px 10px;

overflow: auto;

overflow-y: auto;

}



.menuBck {

float: left;

width: calc(100% - 20px);

}



.style-tabela > table {

overflow-y: scroll;

border-collapse: collapse;

border-style: solid;

border-width: 1px;

width: 99.5% !important;

}



.style-tabela > table td, .style-tabela > table th {

padding: 5px 5px 5px 5px;

border: 1px solid;

white-space: nowrap;

 }



.style-tabela > table > thead th {



top: -1px;

position: sticky;



}

The problem is coming from: position: sticky;

One option is to add an outline to your table header:

.style-tabela > table > thead th {

    top: 0px;

    position: sticky;

    outline: 1px solid;                         

    border:none; 

    outline-offset: -1px;

}