reset.css

html,body {    height: 100%;}body {    line-height: 1;}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 {    margin: 0;    padding: 0}body,button,input,select,textarea,pre {    font-size: 12px;    font-family: Arial, Helvetica, STHeiti, "宋体"}h1,h2,h3,h4,h5,h6 {    font-size: 100%;}/*font-size: 100%;  如果父元素中尺寸没设置，就会一直追溯到body和html上的字体设置,比方说html{font:12px/1.5 Tahoma, Helvetica, Arial,sans-serif;color:#747474} 100%就是12px；*/address,cite,dfn,em,var {    font-style: normal;}code,kbd,pre,samp {    font-family: couriernew, courier, monospace;}small {    font-size: 12px;}ul,ol {    list-style: none;}/* 去除列表的原点 */fieldset,img {    border: 0;}/* 去除边框 */a {    text-decoration: none;}/* 去除a标签默认的下划线 */a:hover {    text-decoration: underline;}/* 设置a标签划过的时候下划线 */sup {    vertical-align: text-top;}sub {    vertical-align: text-bottom;}button,input,select,textarea {    font-size: 100%;}table {    border-collapse: collapse;    border-spacing: 0;}/* 设置table边框很是方便的 *//* 设置上标和下标  *//* 清除浮动 防止父级塌陷 */.clearfix:before,.clearfix:after {    content: ' ';    display: table;}.clearfix:after {    clear: both;}