/*重置样式表  reset.css /normallize.css*/
*{
    margin: 0;
    padding: 0;}
ul,ol{
    list-style: none;}
a{
    text-decoration: none;  /*去掉下划线*/ 
    color: #000000;}
input{
    outline: none;   /*去掉表单显示颜色*/
    border: 0;}
/*在ie低级版本中  引入的图片   自带边框*/
img {
    border: 0;}
.clear:before,.clear:after{
    content: '';
    display: table;}
.clear:after{
    clear: both;}
.clear{
    zoom: 1;}