JSFiddle - React, Tailwind, and code Playground

by minitech

HTML

<div id="eighty-percent"><img class="vertical-centering" src="blank.png" />80% height, yay!</div>

CSS

#eighty-percent {
    background-color: red;
    bottom: 20%;
    color: white;
    font-family: Arial;
    font-size: 40px;
    font-weight: bold;
    left: 0;
    position: absolute;
    right: 0;
    text-align: center;
    top: 0;
}

.vertical-centering {
    height: 100%;
    vertical-align: middle;
    width: 0;
}