.ctrl {
    width: 10%;
    height: 10%;
    position: absolute;
    bottom: 5%;
    border-radius: 10%;
    background-color: rgba(255,255,255,0);
    display: none;
}
#play {
    width: 20%;
    height: 20%;
    left: 40%;
    bottom: 30%;
    font-size: 36px;
    background-color: rgba(255,200,200,0.5);
}
#left {
    left: 5%;
}
#right {
    left: 20%;
}
#jump {
    right: 20%;
}
#attack {
    right: 5%;
}