JSFiddle - React, Tailwind, and code Playground

HTML

<div id='wrapper'>
    <div id='child1' class='child'></div>
    <div id='child2' class='child'></div>
    <div id='child3' class='child'></div>
    <div id='child4' class='child'></div>
</div>

CSS

#wrapper {
    height: 30px;
    width: 400px;
    background: red;
}
#child1 {
    height: 100%;
    width: 50px;
    background: #333;
}
#child2 {
    height: 100%;
    width: 100px;
    background: #666;
}
#child3 {
    height: 100%;
    width: 180px;
    background: #999;
}
#child4 {
    height: 100%;
    width: 70px;
    background: #ccc;
}
.child {
    float: left;
}