CodePen Embed - wEwqWb

 <div class="box-1">垂直置中</div>

.box-1{
width: 100px;
height: 100px;
line-height:  100px;
max-width:  100%;
text-align:  center;
background-color:  #dcdcdc;
 }

This Pen is owned by Ya on CodePen.

This Pen doesn't use any external CSS resources.

This Pen doesn't use any external JavaScript resources.