JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<div class="sidebar"></div>
<div class="column"></div>
</div>

CSS

.container {
    border: 1px solid red;
    overflow:hidden;
    position:relative;
    height:300px;
}

.sidebar {
    border: 1px solid blue;
    width: 50px;
    min-height: 10px;
    position:absolute;
    top:0;
    bottom: 0;
    background-color:lime;
}

.column {
    border: 1px solid black;
    width: 100px;
    height: 200px;
    margin-left: 50px;
}

JavaScript

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