JSFiddle - React, Tailwind, and code Playground

HTML

<header>header</header>
<section>content</section>    
<footer>footer</footer>

CSS

html {
    height: 100%;
    margin: 0px;
    padding: 0px;
}

body {
    position: relative;
    height: 100%;
    padding: 100px 0px;
    
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

body > header, body > section, body > footer {
    display: block;  
    width: 100%;
}

body > header, body > footer {
    position: absolute;
    height: 100px; 
    background-color: green;   
}

body > header { top: 0px }
footer { bottom: 0px }

section {
    height: 100%;
    background-color: red;
}