This Code Is for Vertical Middle and Horizontal Center Align without specify fixed height:
.parent-class-name {_x000D_
position: relative;_x000D_
}_x000D_
_x000D_
.className {_x000D_
position: absolute;_x000D_
top: 50%;_x000D_
left: 0;_x000D_
right: 0;_x000D_
margin: 0 auto;_x000D_
transform: translateY(-50%);_x000D_
-moz-transform: translateY(-50%);_x000D_
-webkit-transform: translateY(-50%);_x000D_
}
_x000D_