JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="footer">
    </div>
</div>

CSS

.container{ position:relative; height:300px;; width:980px; margin:0px auto; background:yellow }
.footer{ width:100%; background-color:#333; height:100px; position: fixed;
bottom: 0px; }