取消padding i和em的默认样式

body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,blockquote,th,td,img,u,i {list-style:none;padding:0;margin:0;}

img,input{border: 0;}

 i ,em{font-style:normal }