body {
    background: darkgrey;
}
.gamepad {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin-top: 0px !important;
    margin-left: 0px !important;
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}