.clearfix{display:block;clear:both;float:none;}
body{ display: block; margin: 0; padding: 0; font-family: 'Roboto', sans-serif;  }



.video-back{display:block;padding:0px 0px 0px 0px;text-align:center;}
.video-back h1{display:block;text-align:center;color:#fff;font-size:50px;}
.video-back p{display:block;color:#fff;margin:0px;padding:0px;margin-bottom:20px;}
.video-back img{width:150px;}

.main-heading{text-align: center;margin: 50px auto;font-size: 70px;}
.main-para{margin: 10px 100px;text-align: center; font-size: 20px;}
.jq22-demo a{ color: aliceblue; font-family: "微软雅黑"; font-size: 20px; text-decoration: none; padding-left: 10px; padding-right: 10px; font-weight: bold;text-shadow:2px 2px 4px #000; }