JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
       <div class="box">
            This box should stretch to 100% of page and must have non-fixed height.This box should stretch to 100% of page and must have non-fixed height.This box should stretch to 100% of page and must have non-fixed height.This box should stretch to 100% of page and must have non-fixvwvwavwaved height.This box should stretch to 100% of page and must have non-fixed height.
       </div>
</div>

CSS

html, body {
    height:100%;
}
.container {
    margin:0 auto;
    width:100px;
    background:0;
    height:100%;
}
.box {
    background:#ccc;
    position:absolute;
    left:0;
    right:0;
}