I often use CSS reset.

1 @ charset "UTF-8"; 2/* CSS reset for XHTML */3 HTML {color: #000; Background: # fff} 4 body, Div, DL, DT, DD, ul, ol, Li, H1, H2, H3, H4, H5, H6, pre, code, form, fieldset, legend, input, textarea, P, BLOCKQUOTE, Th, TD {margin: 0; padding: 0} 5 Table {border-collapse: collapse; border-Spacing: 0} 6 fieldset, IMG {border: 0} 7 address, caption, cite, code, dfn, em, strong, Th, VAR {font-style: normal; font-weight: normal} 8 ol, UL {list-style: None} 9 caption, th {text-align: Left} 10 H1, H2, H3, H4, H5, H6 {font-size: 100%; font-weight: normal} 11 Q: before, Q: after {content: ''} 12 abbr, acronym {border: 0; font-variant: normal} 13 sup {vertical-align: Text-top} 14 sub {vertical-align: text-bottom} 15 input, textarea, select {font-family: Inherit; font-size: Inherit; font-weight: Inherit} 16 input, textarea, select {* font-size: 100%} 17 legend {color: #000} 18/* remove the dotted box when the link gets the focus */19 A {text-Decoration: none; outline: none;} 20 A: hover {text-Decoration: underline;} 21 A: Active {Star: expression (this. onfocus = This. blur ()/* IE6/7, this code will interrupt the tab, and excessive use of CSS expressions will seriously affect the page performance */;} 22 A: Focus {outline: none ;} 23/* solve the problem of no vertical center in the row height of button text setting in Firefox */24 button:-moz-focus-inner, input [type = "reset"]: -Moz-focus-inner, input [type = "button"]:-moz-focus-inner, input [type = "Submit"]: -Moz-focus-inner, input [type = "file"]> input [type = "button"]:-moz-focus-inner {border: none/* de-dotted box */; padding: 0;} 25/* frequently used CSS */26. CL {clear: Both;} 27. fix {ZOOM: 1;} 28. fix: After {content :". "; display: block; Height: 0; font-size: 0; overflow: hidden; clear: Both;} 29. FL {float: Left;} 30. FR {float: Right;} 34. rel {position: relative;} 35. ABS {position: absolute;} 37. block {display: block;} 38. none {display: none;} 39/* font (UNICODE): (\ 5b8b \ 4f53) (\ 9ed1 \ 4f53) (\ 5fae \ 8f6f \ 96c5 \ 9ed1) */40 body {Font: 12px/150% \ 5b8b \ 4f53, sans-serif ;}