JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="left"></div>
    <div class="right"></div>
</div>

CSS

.parent{
    width:100%;
    height:50px;
    background-color:#888;
}
.left{
    float:left;
    height:50px;
    width:50px;
    background-color: green;
    display:inline-block;
}
.right{
    float:left;
    height:50px;
    width: 150px;
    background-color: blue;
    display:inline-block;
}