https://www.cnblogs.com/moqiutao/p/4807792.html
#apDiv2 {
position: absolute;
width: 200px;
height: 115px;
line-height:115px;
z-index: 1;
left: 289px;
top: 164px;
background-color: #CCCCCC;
text-align:center;
}
垂直居中line-height 在height后等于height的值