ArtPlayer/docs/gif/css/common.css

html, body, .container {
    height: 100%;
}

.container {
    display: flex;
    flex-direction: column;
}

.part-top {
    display: flex;
    height: 70%;
}

.part-bottom {
    position: relative;
    height: 30%;
}

.part-left {
    width: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.part-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.part-left .artplayer {
    width: 500px;
    height: 500px;
    background: #fff;
}

.part-right .preview {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 500px;
    height: 500px;
    background: #f3f3f3;
}

.part-right .preview img {
    max-width: 100%;
}