The method of the vertical center of the absolute positioning element to locate the vertical center of the positioning Element

The method of the vertical center of the absolute positioning element to locate the vertical center of the positioning Element

1.css Center

Disadvantage: You need to know the width and height of the element in advance.

1 <! Doctype html> 2 
2,Css3 achieves horizontal and vertical center
Note: The element can be centered regardless of its size. However, IE8 and above are compatible with this method, which can be ignored on mobile terminals.
1 <! Doctype html> 2 
3,Margin: auto center
1 <! Doctype html> 2 
(Reproduced: http://www.qdfuns.com/notes/21738/93c9220f8fa40767833b80439291b1bd.html)