.video_img{
  width: 100%;
  margin-bottom: 30px;
}
.youtube-video-play-button {
    height: 30px;
    width: 45px;    
    background-color: rgba(50, 50, 50, 0.75);
    border-radius: 5px;
    opacity:0.6;
    position:absolute;
    top: 50%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
}
.openbox:hover .youtube-video-play-button {
    background-color: rgba(255, 69, 70, 0.9);
    opacity:1.0;
    cursor:pointer;
}
.youtube-video-play-button:after {
    content: "";
    display: block;
    position: absolute;
    top: 7px;
    left: 16px;
    margin: 0 auto;
    border-style: solid;
    border-width: 8px 0 8px 16px;
    border-color: transparent transparent transparent rgba(255, 255, 255, 1);
}