.title {
    width: 100%;
    height: 40px;
    line-height: 40px;
    font-weight: 500;
    color: #3D3D3D;
    text-align: center;
    margin: 3.9rem 0 3.6rem;
    font-size: 28px;
}

.video {
    width: 100%;
    height: auto;
    min-height: 100%;
    position: relative;
    padding-bottom: 57%;
    overflow: hidden;
}

.video video {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
}

.video img {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    width: 80px;
    height: 80px;
}

.videoname {
    width: 100%;
    font-size: 20px;
    text-align: center;
    margin: 14px 0 20px;
    color: #6C6C6C;
}


/* 宽度小于530px  iphone 5/SE 、678 */

@media screen and (max-width: 530px) {
    .title {
        margin: 20px 0;
    }
    .video {
        height: 280px;
    }
    .video img {
        width: 50px;
        height: 50px;
    }
    .videoname {
        font-size: 16px;
    }
}