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