.to-top {
    right: 20px;
    bottom: 60px;
    color: #666;
    width: 40px;
    height: 40px;
    font-size: 16px;
    line-height: 40px;
    cursor: pointer;
    position: fixed;
    overflow: hidden;
    text-align: center;
    background-color: #fff;
    border: 2px solid #999;
    z-index: 666;
    display: none;
}
.to-top:hover {
    color: #333;
    border: 2px solid #666;
}

@media only screen  and (min-device-width : 768px)  and (max-device-width : 1024px){
    .sm-video-container .sm-video-popup {
        width: 100%;
        height: 50%;
        max-width: 100%;
        /* max-height: 100%; */
        display: inline-block;
        vertical-align: middle;
        position: relative;
        background: #fff;
        box-shadow: 1px 1px 50px rgba(0,0,0,.3);
        padding: 0;
        margin: auto;
    }
}
@media only screen  and (min-device-width : 768px)  and (max-device-width : 1024px)  and (orientation : landscape){
    .sm-video-container .sm-video-popup {
        width: 100%;
        height: 50%;
        max-width: 100%;
        /* max-height: 100%; */
        display: inline-block;
        vertical-align: middle;
        position: relative;
        background: #fff;
        box-shadow: 1px 1px 50px rgba(0,0,0,.3);
        padding: 0;
        margin: auto;
    }
}
@media (max-width: 1024px) {
    .sm-video-container .sm-video-popup {
        width: 100%;
        height: 50%;
        max-width: 100%;
        /* max-height: 100%; */
        display: inline-block;
        vertical-align: middle;
        position: relative;
        background: #fff;
        box-shadow: 1px 1px 50px rgba(0,0,0,.3);
        padding: 0;
        margin: auto;
    }
}