.w {
    width: 0%;
    min-width: 1200px;
    margin: 0 auto;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.container {
    width: 100%;
    min-height: 68vh;
}

.video_center {
    width: 100%;
    margin: 50px 0;
    box-sizing: border-box;
}

.video_center div:nth-of-type(1) {
    width: 100%;
    height: 50px;
    line-height: 50px;
    box-sizing: border-box;
    padding-left: 20%;
    font-size: 20px;
}

.video_center div:nth-of-type(2) {
    width: 100%;
    height: 40px;
    line-height: 40px;
    box-sizing: border-box;
    padding-left: 20%;
    color: #999;
}

.video_center div:nth-of-type(3) {
    width: 100%;
    height: 40px;
    line-height: 40px;
    box-sizing: border-box;
    padding-left: 20%;
    margin-bottom: 50px;
}

.video_center video {
    display: block;
    width: 65%;
    margin: 30px auto;
}