JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="side">Its side bar</div>
    <div class="main">ites center bar</div>
</div>

CSS

.container {
    width:100%;
    height:920px;
}
.side {
    background-color:#9966FF;
    width:20%;
    height:460px;
    float:left;
}
.main {
    background-color:#CCFFFF;
    height:920px;
}