JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="child1"></div>
    <div id="child2"></div>
    <div id="child3"></div>
</div>

CSS

#container {
    position: relative;
    width: 302px;
    height: 40px;
    border: solid 1px black;
}

#child1 {
    position: absolute;
    left: 0;
    width: 100.67px;
    height: 40px;
    background: red;
}

#child2 {
    position: absolute;
    left: 100.67px;
    width: 100.67px;
    height: 30px;
    background: green;
}

#child3 {
    position: absolute;
    left: 201.33px;
    width: 100.67px;
    height: 20px;
    background: blue;
}