JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="flexbox-1">.flexbox-1</div>
    <div class="flexbox-2">.flexbox-2</div>
</div>

CSS

* {
    box-sizing: border-box;
}

body {
    font-family: helvetica, serif;
}

.container {
    display: -webkit-flex;
    -webkit-flex-direction: row;
}

.flexbox-1 {
    -webkit-flex: 1;
    border: solid 3px red;
}

.flexbox-2 {
    -webkit-flex: 2;
    border: solid 3px blue;
    height: 200px;
    margin-left: 10px;
}

.container > div {
    text-align: center;
    font-weight: bold;
    padding-top: 50px;
}