背景图片 由远及近 由近及远

.square-header {

    width: 100%;

    height: 470px;

    margin-top: -77px;

    font-size: 44px;

    line-height: 540px;

    color: #fff;

    background: url(http://mat1.gtimg.com/v/coral_yp_2015_v3.0/square/images/header.jpg) center top no-repeat #190102;

    animation: starbigger 20s infinite ease;

}