JSFiddle - React, Tailwind, and code Playground

HTML

<section>
<h1>some long long long long header, a whole line, 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6</h1>
<div><button>button</button>
</div>
</section>

CSS

section {
    position: relative;
    width: 50%;
    border: 1px solid;
}
h1 {
    display: inline;
}
div {
    position: absolute;
    top: 0;
    right: 0;
}