JSFiddle - React, Tailwind, and code Playground

HTML

<div class="b">
    <div class="b1"></div>
    <div class="b2"></div>
    <div class="b3"></div>
</div>

CSS

.b {
    width: 50%;
    height: 100px;
}

.b1 {
    width: 40px;
    float: left;
    background-color: #f00;
    height: 100px;
}

.b2 {
    width: 30px;
    float: left;
    background-color: #0f0;
    height: 100px;
}


.b3 {
    margin-left: 70px;
    background-color: #00f;
    height: 100px;
}