JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
   <div id="header">header</div>
    <div id="body">body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
        body<br />
    </div>
   <div id="footer">footer</div>
</div>

CSS

html,
body {
   margin:0;
   padding:0;
   height:100%;
}
#container {
   min-height:100%;
   position:relative;
}
#header {
   background:#ff0;
   padding:10px;
}
#body {
   padding:10px;
   padding-bottom:60px;   /* Height of the footer */
}
#footer {
   position:absolute;
   bottom:0;
   width:100%;
   height:60px;   /* Height of the footer */
   background:#6cf;
}