JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div>foo barfoo bar</div>
    <div>foo bar</div>
</div>

<div class="container">
        <div>foo barfoo barfoo barfoo barfoo barfoo barfoo bar
        foo barfoo barfoo barfoo barfoo barfoo barfoo bar
        foo barfoo barfoo barfoo barfoo barfoo barfoo bar</div>
    <div>foo bar</div>
</div>

CSS

.container {
    display: -webkit-flex;
}

div {
    white-space: nowrap;
    text-overflow: ellipsis;
}

.container > div:last-child {
    -webkit-flex: 1;
    background: red;
}