.poster-box {
    text-align: left;
    margin: 0 auto;
    width: 62.5%;
}

.video {
    width: 62.5%;
    margin: 0 auto;
    margin-top:84px;
    min-height:700px;
}
.teacherVideo {
    padding-top:42px;
}
.title {
    width: 100%;
    height: 35px;
    font-family: MicrosoftYaHei-Bold;
    font-family: "微软雅黑";
    font-weight: bold;
    font-size: 2.25rem;
    color: #22ac38;
    margin-bottom: 2.62rem;
}
.boxy-wrapper.fixed {
    position: fixed;
}
.poster-item {

    width: 32%;
    display: inline-block;
    position: relative;
    vertical-align: middle;
    margin-left: 1%;
    margin-bottom:42px;
}

.video-img {
    width: 100%;
    height: auto;
    cursor: pointer
}

.play {
    position: absolute;
    cursor: pointer;
    right: 50%;
    bottom: 50%;
}

.video-desc {
    width: 100%;
    height: 55px;
    line-height: 55px;
    font-size: 1rem;
    text-align: center;
    color: #474747;
    font-family: SourceHanSansCN-Normal;
    background: #e7f1f6;
}

.coverDiv {
    position: relative;
}

.cover {
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    display: flex;
    cursor: pointer;
}

.play-icon {
    position: absolute;
    right: 65px;
    bottom: 130px;
    cursor: pointer
}

.cover img {
    width: 25%;
    height: auto;
}

.videoPic img {
    display: block;
}

.video_box_close {
    position: absolute;
    right: -14px;
    top: -10px;
    display: block;
    width: 28px;
    height: 28px;
    cursor: pointer;
    z-index: 99999;
    background-image: url(https://static.okii.com/static/img/btn_close_video.png);
}

.video_box {
    position: relative;
}