JSFiddle - React, Tailwind, and code Playground

HTML

<div class="white">
    <div class="black">1</div>
    <p>Лала</p>
    <p>Лала</p>
    <p>Лала</p>
</div>

CSS

body {
    background: blue;
}

.white {
    background: white;
    width: 500px;
    box-sizing: border-box;
    margin: 0 auto;
    padding-left: 30%;
    position: relative;
}

.black {
    background: grey;
    position: absolute;
    width: 30%;
    left: 0;
    height: 100%;
}