今天无意间发现了一个不错的特效，就是呼吸灯效果，感觉用来放在海报周围很炫酷，用在其他地方也是不错的。
原理就是before伪元素 + animation动画 + box-shadow盒子阴影。进入demo按F12查看Elements基本能知道是怎么实现了。
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