css hr 设置

http://www.sovavsiti.cz/css/hr.html

http://adamculpepper.net/blog/css/hr-tag-css-styling-cross-browser-compliant/

http://blog.puglypixel.com/2013/02/12/css-lines-and-section-dividers/

http://css-tricks.com/examples/hrs/

http://magicaleditor.com/css-divider-snippets/ 非常好