仅在一个方向上滚动背景

Question

我只想从下到上具有背景滚动效果，但是我不知道该怎么做。
我已经尝试过使用CSS，但是这里出现的问题是它在两个方向上滚动，即从下到上和从上到下。

 * { margin: 0; padding: 0; } div { width: 100vw; height: 100vh; animation: change 2s infinite ease-in both; background-image: url(http://hdwallpaperbackgrounds.net/wp-content/uploads/2016/07/background-pictures-2.jpg); background-size: cover; background-repeat: no-repeat; } @keyframes change { 0%, 100% { background-position: 0% 5%; } 5% { background-position: 0% 10% } 10% { background-position: 0% 15% } 15% { background-position: 0% 20% } 20% { background-position: 0% 25% } 25% { background-position: 0% 30%; } 30% { background-position: 0% 35% } 35% { background-position: 0% 40% } 40% { background-position: 0% 45% } 45% { background-position: 0% 50% } } 

 <div> <h1> This is animating background ...</h1> </div> 

Answer 1

您可以通过使用关键帧更改的to和from属性来实现。 效果有点怪异，因为背景的顶部和底部并不吻合...

 * { margin: 0; padding: 0; } div { width: 100vw; height: 100vh; animation: change 3s linear infinite; background-image: url(http://hdwallpaperbackgrounds.net/wp-content/uploads/2016/07/background-pictures-2.jpg); background-size: cover; background-repeat: repeat-y; background-position: 0 0; } @keyframes change { from { background-position: 0 100vh; } to { background-position: 0 0; } } 

 <div> <h1> This is animating background ...</h1> </div>