aspect-radio 保持元素宽高比

• 常用于响应式中

.song{
    aspect-ratio: 1 / 1; //宽高比为1：1
}

也可以用padding-top来实现，如

1:1 aspect ratio = 1 / 1 = 1 = padding-top: 100%
4:3 aspect ratio = 3 / 4 = 0.75 = padding-top: 75%
3:2 aspect ratio = 2 / 3 = 0.66666 = padding-top: 66.67%
16:9 aspect ratio = 9 / 16 = 0.5625 = padding-top: 56.25%

参考 https://blog.csdn.net/qq_37954086/article/details/113526080