.mc-start {
    width: 250px;
    height: 70px;
    background: url(images/start.png) no-repeat center;
    background-size: 100% 100%;
    display: inline-block;
    cursor: pointer;
}

.mc-play {
    width: 250px;
    height: 70px;
    background: url(images/play.png) no-repeat center;text-align:center;font-size:14px;line-height:70px;
    background-size: 100% 100%;
    display: inline-block;
    cursor: pointer;
}