@charset "utf-8";
html,body{
    background:#F7F8FA !important;
}
.banner{
    width: 100%;
    height: 500px;
    position: relative;
    margin-bottom: 110px;
    background: url(../images/learn_ban.png) no-repeat center center;
    background-size: cover;
}
.desc_video{
    width: 836px;
    height: 560px;
    position: relative;
    background: url(../images/learn_video_theme.png) no-repeat center center;
    background-size: cover;
    margin: 0 auto;
}