.video-js .vjs-big-play-button{
    height: 50px;
    width: 50px;
    border: none;
    top: 50%;
    left: 50%;
    margin-top: -25px;
    margin-left: -25px;
}

.video-js:hover .vjs-big-play-button{
    background: #03b4b4;
}

.video-js .vjs-big-play-button:before{
    top: 4px;
}