JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    <div>left</div>
    <div>center</div>
    <div>right</div>
<header>

CSS

header {
    background: green;
    display: table;
    width: 100%;
}
header div {
    display: table-cell;
}
header div:nth-child(1) {
    background: yellow;
    width: 50px;
}
header div:nth-child(2) {
    background: lightblue;
}
header div:nth-child(3) {
    background: blue;
    width: 100px;
}