Twitter-like Header Parallax Effect Using Pure CSS / CSS3

Preview:

Description:

A pure CSS approach to creating Twitter-like header background parallax scrolling effects using CSS, CSS3 transforms and :before pseudo element.

How to use it:

Create a parallax header for your web page.

<header>
  <h1>Parallax header</h1>
</header>

The basic CSS styles.

html {
  height: 100%;
  overflow: hidden;
}
body {
  color: #fff;
  margin: 0;
  padding: 0;
  -webkit-perspective: 1px;
  perspective: 1px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  height: 100%;
  overflow-y: scroll;
  overflow-x: hidden;
}

The core CSS / CSS3 styles for the parallax header.

header {
  box-sizing: border-box;
  min-height: 40vw;
  padding: 30vw 0 5vw;
  position: relative;
  -webkit-transform-style: inherit;
  transform-style: inherit;
  width: 100vw;
}
header,
header:before { background: 50% 50% / cover; }
header::before {
  bottom: 0;
  content: "";
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  display: block;
  background-color: #8a8;
  background-image: url(background.jpg);
  background-size: cover;
  -webkit-transform-origin: center center 0;
  -webkit-transform: translateZ(-1px) scale(2);
  transform-origin: center center 0;
  transform: translateZ(-1px) scale(2);
  z-index: -1;
  min-height: 100vh;
}