视差

视差是一种效果，在这种情况下，背景内容或图像在滚动时以与前景内容不同的速度移动。

视差演示 HTML

    <div class="parallax-container">
      <div class="parallax"><img src="images/parallax1.jpg"></div>
    </div>
    <div class="section white">
      <div class="row container">
        <h2 class="header">Parallax</h2>
        <p class="grey-text text-darken-3 lighten-3">Parallax is an effect where the background content or image in this case, is moved at a different speed than the foreground content while scrolling.</p>
      </div>
    </div>
    <div class="parallax-container">
      <div class="parallax"><img src="images/parallax2.jpg"></div>
    </div>