JSFiddle - React, Tailwind, and code Playground

flexbox header-main-footer

by CBroe

HTML

<header>
  <h1>
  Header
  </h1>
</header>
<main>
  <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
  <a href="#more-1" id="more-1" class="expand">More</a> <a href="#less-1" id="less-1">Less</a>
  <p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore agna aliquyam erat, sed diam voluptua.</p>
  <p>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p><p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore agna aliquyam erat, sed diam voluptua.</p>
  <p>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p><p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore agna aliquyam erat, sed diam voluptua.</p>
  <p>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p><p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore agna aliquyam erat, sed diam voluptua.</p>
  <p>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p><p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore agna aliquyam erat, sed diam voluptua.</p>
  <p>At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit...

CSS

* { margin:0; padding:0; box-sizing:border-box; }
body { display:flex; flex-direction:column; max-width:40em; min-height:100vh; margin:auto;  background:#ff9; }
body > header, body > main, body > footer { margin:0 6vw; padding:4vw; /*outline:1px dashed red;*/ background:#ccc; }
body > main { flex:1; padding-top:4vw; padding-bottom:4vw; background:#ddd; }

@media screen and (min-aspect-ratio: 1/1) {
  body { background:blue; }
  body > header, body > main, body > footer { margin:0 6vh; padding:4vh; }
  body > main { padding-top:4vh; padding-bottom:4vh; }
}

x.expand + a ~ * { display:none; }
x.expand:target + a ~ * { display:block; }

nav { position:fixed; top:100%; left:0; right:0; transform:translateY(-5%); transition: all 1s ease-out; cursor:pointer; }
nav:hover { transform:translateY(-100%); }
nav ul { background:#ccc; padding-top:5vh; overflow:hidden; transition: all 1s ease-out;}
nav:hover ul { padding-top:0; }
nav ul li { margin:2vh; padding:2vh; background:#333; color:#aaa; font-size:1.25em; transition: all 1s ease-out;}
nav ul li:hover { background:#000; color:#ccc; }