淘宝的公共样式：
body, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, form, fieldset, legend, button, input, textarea, th, td, a{ margin:0; padding:0; }
ul, ol { list-style:none; }
a { text-decoration:none;color:#000; }
sup { vertical-align:text-top; }
sub{ vertical-align:text-bottom; }
legend { color:#000; }
fieldset, img { border:0; }
table { border-collapse:collapse; border-spacing:0; }
.clearfix:after{content:"";display:block;visibility:hidden;clear:both;height:0;}