JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="block_01 block"></div>
    <div class="block_02 block"></div>
</div>

CSS

.wrapper {
    width: 300px;
    height: auto;
    font-size: 0;
}

.block {
    display: inline-block;
    width: 50%;
    height: 100px;
    font-size: 10px;
}

.block_01 {
    background-color: red;
}

.block_02 {
    background-color: blue;
}