JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <article class="leftnews">left<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>end</article>
    <article class="rightnews">right</article>
</div>

CSS

.container {
    display: table;
    width: 100%;
}

.leftnews,
.rightnews {
    display: table-cell;
    width: 50%;
    background: pink;
}

.leftnews {
    background: lime;
}