JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="col1">Column 1</div>
    <div class="col2">Column 2</div>
</div>

CSS

.container {
    width: 960px;
    margin: 0 auto;
}

.col1 {
    width: 605px;
    background: red;
    display: inline-block;
    margin-right: 50px;
    height: 1000px;
    float: left;
}

.col2 {
    width: 305px;
    background: blue;
    display: inline-block;
    height: 1000px;
    float: left;
}