.html5-video-player:not(.ytp-transparent), .html5-video-player.unstarted-mode, .html5-video-player.ad-interrupting, .html5-video-player.ended-mode, .html5-video-player.ytp-fullscreen {
    background-color: #111 !important;
}
.start_button {
    width: 20px;
    height: 40px;
    position: relative;
    margin: 18px 32px;
    overflow: hidden;
    box-shadow: none;
}
.start_button:after {
    content: "";
    position: absolute;
    width: 100px;
    height: 100px;
    background: #111;
    transform: rotate(45deg);
    bottom: -29px;
    left: -101px;
    box-shadow: none;
}
.play_button{
    display: none;
    background-color: white;
    overflow: hidden;
    position:  absolute;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
    border-radius: 100%;
    width: 75px;
    height: 75px;
    z-index: 999;
}
.tag_video{
    margin: 0 auto;
}
@media screen and (max-width: 767px){
    .video {
        height: 30%;
        margin-top: 60px;
    }
    .play_button{
        width: 50px;
        height: 50px;
    }
    .start_button {
        width: 15px;
        height: 30px;
        margin: 10px 21px;
    }
    .start_button:after {
        bottom: -35px;
        left: -108px;
    }
}