30秒学会 CSS 片段 – Zoom in zoom out animation

Creates a zoom in zoom out animation.

• Use @keyframes to define a three-step animation. At the start (0%) and end (100%), the element is its original size (scale(1 ,1)). Halfway through (50%) it’s scaled up to 1.5 times its original size (scale(1.5, 1.5)).
• Use width and height to give the element a specific size.
• Use animation to set the appropriate values for the element to make it animated.

预览

HTML

<div class="zoom-in-out-box"></div>

CSS

.zoom-in-out-box {
  margin: 24px;
  width: 50px;
  height: 50px;
  background: #f50057;
  animation: zoom-in-zoom-out 1s ease infinite;
}

@keyframes zoom-in-zoom-out {
  0% {
    transform: scale(1, 1);
  }
  50% {
    transform: scale(1.5, 1.5);
  }
  100% {
    transform: scale(1, 1);
  }
}

翻译自：https://www.30secondsofcode.org/css/s/zoomin-zoomout-animation