JSFiddle - React, Tailwind, and code Playground

HTML

<table class="tblresults txtblack">
                            <tr class="tblresultshdr bold">
                                <td class="col1">Company</td>
                                <td>Currency</td>
                                <td>Bid</td>
                                <td>Ask</td>
                                <td>YTD Vol</td>
                            </tr>
                            <tr>
                                <td class="col1">ABC</td>
                                <td>GBP</td>
                                <td>94</td>
                                <td>16</td>
                                <td>3,567,900</td>
                            </tr>
                            <tr>
                                <td class="col1">DEF</td>
                                <td>GBP</td>
                                <td>3</td>
                                <td>46</td>
                                <td>10,000</td>
                            </tr>
                            <tr>
                                <td class="col1">GHI</td>
                                <td>GBP</td>
                                <td>3</td>
                                <td>46</td>
                                <td>10,000</td>
                            </tr>
                            <tr>
                                <td class="col1">JKLM</td>
                                <td>GBP    </td>
                                <td>7</td>
                                <td>46</td>
                                <td>56,000</td>
                            </tr>
                        
                            <tr>
                                <td colspan="5" class="bold" >Investments</td>
                            </tr>
                            <tr>
                                <td class="col1">ghjk</td>
                                <td>GBP</td>
                                <td>13</td>
                               ...

CSS

table.tblresults {
    width:100%;
    *width:99.5%;
    border: 1px solid #b9b8b8;
    top: 0;
}
table.tblresults tr.tblresultshdr {background: lightgrey;}
table.tblresults tr.tblresultshdr td {padding: 6px;}
table.tblresults td {padding: 8px; border: 1px solid #b9b8b8;}
table.tblresults td.col1 {width: 70%;}