css3 实现页面灯光闪烁效果

实现效果：

HTML：

<div class="lamp-container"></div>

css:

.lamp-container {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200px;
  height: 200px;
  -webkit-animation-timing-function: ease-in-out;
  -webkit-animation-name: breathe;
  -webkit-animation-duration: 1000ms;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-direction: alternate;
}

@-webkit-keyframes breathe {
  0% {
    opacity: 0.2;
    background: radial-gradient(56% 56% at 51% 47%, rgba(33, 2, 2, 0) 0%, rgba(255, 4, 4, 0.31) 100%);
  }

  100% {
    opacity: 1;
    background: radial-gradient(56% 56% at 51% 47%, rgba(33, 2, 2, 0) 0%, rgba(255, 4, 4, 0.31) 100%);
  }
}

参考文章：css3实现科技感的呼吸灯效果_css3呼吸灯-CSDN博客