JSFiddle - React, Tailwind, and code Playground

HTML

<div class="body">
    <div class="header">header</div>
    <div class="content">content</div>
    <div class="footer">footer</div>
</div>

CSS

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

.body{
    position:relative;
    margin:0px auto;
    max-width:800px;
    min-height:100%;
}

.header{
    height:50px;
}

.content{
    padding-bottom:100px;
}

.footer{
    position:absolute;
    left:0px;
    right:0px;
    bottom:0px;
    height:100px;
}

.header,.footer{
    border-top:1px solid #bbbbbb;
    border-bottom:1px solid #bbbbbb;
}