JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="one">This is some extra long super informative text.</div>
    <div class="two">Shorter Text</div>
</div>

CSS

body {
    margin: 0;
    padding: 40px;
}
.container {
    border: 1px solid #444;
    width: auto;
    height: 30px;
    line-height: 30px;
    display: flex;
}
.one, .two {   
}
.one {
    background: #eff;
    flex: 1 1 auto;
}
.two {
    background: #fef;
    flex: 0 0 auto;
}