css priority and corresponding weight

1. priority selector

　　! important> Inline selector (style)> id selector> class selector | attribute selector | pseudo class selector> element selectors> wildcard (*)

2. Select the device weight (weight calculation can avoid many problems by rights)

!important	10000
Inline selector	1000
id selector	100
Class selector	10
Element selector	1

　　eg: body #sum {width: 100px;} Results: 100 + 1 = 101.

　　ps :! important at some point will fail (of course can not! imortant not use)

　　 　　eg:box{

　　　　　　　　width:100px!important;

　　　　　　　　min-width:200px;　　　　

　　　　　　}

　　at this time! important fail, the final width will be 200px.