nutui/src/packages/video/video.scss

.nut-video{
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    .nut-videoplayer{
        width: 100%;
    }
    .playing-mask{
        width: 100%;
        height: 100%;
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
    }
    .nut-video-play-btn{
        // display: none;
        top: 50%;
        left: 50%;
        margin-left: -1em;
        width: 2em;
        border: 0;
        background-color: rgba(0,0,0,.45);
        color: #fff;
        transition: border-color .4s,outline .4s,background-color .4s;
        position: absolute;
        padding: 0;
        cursor: pointer;
        opacity: 1;
        background-color: rgba(0,0,0,.5);
        font-size: 2.5em;
        border-radius: 20%;
        height: 1.4em;
        line-height: 1.4em;
        margin-top: -.7em;
        text-align: center;
        &:hover{
            background-color: #cc181e;
        }
        &:before{
            content: '';
            background: url('../../assets/img/video-icon.png') no-repeat;
            width: 40px;
            height: 31px;
            display: inline-block;
            background-position: 0 0;
            background-size: 218px 38px;
        }
    }
}