第一种呼吸灯

<iframe width="100%" height="300" src="https://jsfiddle.net/4p5gmv0r/embedded/result,html,css/" frameborder="0" loading="lazy" allowtransparency="true" allowfullscreen="true"></iframe>

第二种呼吸灯

<iframe width="100%" height="300" src="https://jsfiddle.net/7czfydjx/6/embedded/result,html,css/" frameborder="0" loading="lazy" allowtransparency="true" allowfullscreen="true"></iframe>

第三种呼吸灯

<iframe width="100%" height="300" src="https://jsfiddle.net/gy3fden0/6/embedded/result,html,css/" frameborder="0" loading="lazy" allowtransparency="true" allowfullscreen="true"></iframe>