JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child-big"></div>
    <div class="child">
        <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p <p>qwqwqwqwqwqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwqqwqqwqwqwqwqwq</p...

CSS

html, body{
    position: relative;
    width: 100%;
    height: 100%;
}
.parent{
    overflow:scroll;
    width: 100%;
    height:100%;
    background: green;
    display:inline-block;
}
.child-big{
    display: block;
    float: left;
    width: 200px;
    height: 500px;
    background: yellow;
}

.child{
    display:block;
    float:left;
    background: blue;
    width: 150px;
    min-height:100%;
    word-wrap:break-word;
}