JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container"><div class="leftColumn">abc</div><div class="rightColumn">content</div></div>

CSS

.container {
    background: rgb( 240, 240, 240);
    width: 300px;
}

.leftColumn {
    width: 40px;
    height: 50px;
    display: inline-block;
    background: rgb(200, 200, 245);
}

.rightColumn {
    display: inline-block;
    width: 250px;
    background: rgb( 200, 244, 244);
}