JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block_level">Hello World</div>

<span class="inline_level">Hello Again</span>

CSS

div.block_level {
    float: left;
    height: 100px;
    width: 100px;
    background: tomato;
}

span.inline_level {
    float: right;
    height: 100px;
    width: 100px;
    background: silver;
}