.text{
text-align:center;
font-size:0;
}
.text span{
vertical-align:middle;
display:inline-block;
font-size:16px;
}
.text:after{
content:‘‘;
width:0;
height:100%;
display:inline-block;
vertical-align:middle;
}
原文：https://www.cnblogs.com/ybixian/p/9842588.html