JSFiddle - React, Tailwind, and code Playground

HTML

<div class="relative-container">
    <div class="child1"></div>
    <div class="child2"></div>
</div>

CSS

.child1, .child2 {
    width: 100px;
    height: 60px;
    background-color: grey;
    margin-right: 10px;
}
.child1 {
    float: left;
}

.child2 {
    float: right;
}

.relative-container {
    position: relative;
    clear: both;
}