Apple Watch 呼吸灯

 flex实现元素居中，设置元素宽高。

使用nth-child选择器定义每一个圆圈的位移。

body {
  background: #000;
  display: flex;
  align-items: center;
  height: 100vh;
  justify-content: center;
}

.watch-face {
  height: 125px;
  width: 125px;
}

.circle {
  background: #fff;
  height: 125px;
  width: 125px;
  border-radius: 50%;
  position: absolute;
  opacity: 0.75;
  transform: translate(0, 0);
}

.circle:nth-child(1) {
  transform: translate(-35px, -50px);
}

.circle:nth-child(2) {
  transform: translate(35px, -50px);
}

.circle:nth-child(3) {
  transform: translate(-60px, 0);
}

.circle:nth-child(4) {
  transform: translate(60px, 0);
}

.circle:nth-child(5) {
  transform: translate(-35px, 50px);
}

.circle:nth-child(6) {
  transform: translate(35px, 50px);
}

 使用nth-child选择器给每一个圆圈指定对应的动画并优化位移 。

animation-timing-function设置ease，可以使动画看起来更加顺滑。

animation-direction设置alternate，这样使动画来回运动。

animation-iteration-count设置inifinite，使动画一直循环播放。

body {
  background: #000;
  display: flex;
  align-items: center;
  height: 100vh;
  justify-content: center;
}

.watch-face {
  height: 125px;
  width: 125px;
}

.circle {
  background: #fff;
  height: 125px;
  width: 125px;
  border-radius: 50%;
  position: absolute;
  opacity: .75;
  transform: translate(0, 0);
}

.circle:nth-child(1) {
  animation: circle-1 4s ease alternate infinite;
}

.circle:nth-child(2) {
  animation: circle-2 4s ease alternate infinite;
}

.circle:nth-child(3) {
  animation: circle-3 4s ease alternate infinite;
}

.circle:nth-child(4) {
  animation: circle-4 4s ease alternate infinite;
}

.circle:nth-child(5) {
  animation: circle-5 4s ease alternate infinite;
}

.circle:nth-child(6) {
  animation: circle-6 4s ease alternate infinite;
}

@keyframes circle-1 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-35px, -50px);
  }
}

@keyframes circle-2 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(35px, 50px);
  }
}

@keyframes circle-3 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-60px, 0);
  }
}

@keyframes circle-4 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(60px, 0);
  }
}

@keyframes circle-5 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-35px, 50px);
  }
}

@keyframes circle-6 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(35px, -50px);
  }
}

 左边圆圈是浅浅绿色，右边是浅浅蓝色。

奇数odd圆圈赋浅浅绿色，偶数even圆圈赋浅浅蓝色，并删除类名circle白色背景。

使用mix-blend-mode设置screen代替opacity。

可以使圆圈颜色相互融合在一起。

body {
  background: #000;
  display: flex;
  align-items: center;
  height: 100vh;
  justify-content: center;
}

.watch-face {
  height: 125px;
  width: 125px;
}

.circle {
  height: 125px;
  width: 125px;
  border-radius: 50%;
  position: absolute;
  mix-blend-mode: screen;
  transform: translate(0, 0);
}

.circle:nth-child(odd) {
  background: #61bea2;
}

.circle:nth-child(even) {
  background: #529ca0;
}

.circle:nth-child(1) {
  animation: circle-1 4s ease alternate infinite;
}

.circle:nth-child(2) {
  animation: circle-2 4s ease alternate infinite;
}

.circle:nth-child(3) {
  animation: circle-3 4s ease alternate infinite;
}

.circle:nth-child(4) {
  animation: circle-4 4s ease alternate infinite;
}

.circle:nth-child(5) {
  animation: circle-5 4s ease alternate infinite;
}

.circle:nth-child(6) {
  animation: circle-6 4s ease alternate infinite;
}

@keyframes circle-1 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-35px, -50px);
  }
}

@keyframes circle-2 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(35px, 50px);
  }
}

@keyframes circle-3 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-60px, 0);
  }
}

@keyframes circle-4 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(60px, 0);
  }
}

@keyframes circle-5 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-35px, 50px);
  }
}

@keyframes circle-6 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(35px, -50px);
  }
}

 类名watch-face创建缩放和旋转动画。

animation-timing-function设置cubic-bezier曲线，使动画运动起来更加的自然。

类名circle创建连续动画。

animation: center 6s infinite，使视觉效果更好协调自然。

body {
  background: #000;
  display: flex;
  align-items: center;
  height: 100vh;
  justify-content: center;
}

.watch-face {
  height: 125px;
  width: 125px;
  animation: pulse 4s cubic-bezier(0.5, 0, 0.5, 1) alternate infinite;
}

.circle {
  height: 125px;
  width: 125px;
  border-radius: 50%;
  position: absolute;
  mix-blend-mode: screen;
  transform: translate(0, 0);
  animation: center 6s infinite;
}

.circle:nth-child(odd) {
  background: #61bea2;
}

.circle:nth-child(even) {
  background: #529ca0;
}

.circle:nth-child(1) {
  animation: circle-1 4s ease alternate infinite;
}

.circle:nth-child(2) {
  animation: circle-2 4s ease alternate infinite;
}

.circle:nth-child(3) {
  animation: circle-3 4s ease alternate infinite;
}

.circle:nth-child(4) {
  animation: circle-4 4s ease alternate infinite;
}

.circle:nth-child(5) {
  animation: circle-5 4s ease alternate infinite;
}

.circle:nth-child(6) {
  animation: circle-6 4s ease alternate infinite;
}

@keyframes pulse {
  0% {
    transform: scale(.15) rotate(180deg);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes circle-1 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-35px, -50px);
  }
}

@keyframes circle-2 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(35px, 50px);
  }
}

@keyframes circle-3 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-60px, 0);
  }
}

@keyframes circle-4 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(60px, 0);
  }
}

@keyframes circle-5 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(-35px, 50px);
  }
}

@keyframes circle-6 {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(35px, -50px);
  }
}