westwin的专栏

http://www.bluerobot.com/web/css/center2.html Centering: Negative Margin This box is horizontally centered using a technique proposed to me by Simon Coggins. First, the box's left edge is position...

一直不太明白bootstrap中.clearfix的作用，在这里发现了答案，http://css-tricks.com/all-about-floats/   .clearfix:before,.clearfix:after {  display: table;  content: " ";}.clearfix:after {  clear: both;} ...