样式初始化:
html,p,span,blockquote,address,cite,code,del,dfn,em,img,ins,kbd,q,samp,small,strong,sub,sup,var,b,i,dl,dt,dd,ol,ul,li,fieldset,form,label,tbody,tfoot,thead,tr,th,td,header{ margin:0; padding:0; } body{ margin: 0; border: 0; } em,i { font-weight:100; font-style:normal; } ul,ol,li { list-style-type:none; } a { color: black; text-decoration:none; outline:0; } a:hover { text-decoration:none; }