centerAlign.md

垂直居中

.dad {
    position: relative;
}
.son {
    position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

.dad {
    position: relative;
}
.son {
    width: 100px;
    height: 100px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -50px;
    margin-left: -50px;
}

TODO...

参考

• http://louiszhai.github.io/2016/03/12/css-center/
• https://juejin.im/post/58e3a5a0a0bb9f0069fc16bb