JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr><td class="left">12345</td><td class="right">...</td></tr>
    <tr><td class="left">123456</td><td class="right">...</td></tr>
    <tr><td class="left">1234567</td><td class="right">...</td></tr>
    <tr><td class="left">12345678</td><td class="right">...</td></tr>
    <tr><td class="left">123456789</td><td class="right">...</td></tr>
    <tr><td class="left">1234567890</td><td class="right">...</td></tr>
</table>

CSS

table
{
    width:100%;
}
.left
{
    width:1px;
    background-color:blue;
    color:white;
}
.right
{
    background-color:gray;
}