Add one :

Give Way DIV Auto Center

width:980px;margin:0 auto;

Supplement 2 :

Introverted label :

inline # Block level tags are converted to inline tags .

block # Into a block level .

inline-block # Inline can use height and width .

Add three :

   Content height :line-height:

Supplement 4 :

background-position  # Like a shopping cart icon , Move matting up and down .

Supplement 5 :

z-index # Designated as grade , The higher the priority , It can be checked by browser .

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