.clearfix:after{
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0;
}
html,body{
    /*overflow-x: hidden;*/
    min-height: 100%;
}
/*屏幕灰度*/
body{
    filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
}