.video_preview {
    position: relative;
    display: block;
}
.video_preview .preview_icon {
    position: absolute;
    display: block;
    width: 150px;
    height: 150px;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}
.video_preview .preview_icon img {
    width: 100%;
}