button.gm-control-active {
    display: none;
}

button.gm-control-active img {
    display: none;
}

button.gm-control-active img:nth-child(1) {
    display: block;
}

.gm-control-active:hover img:nth-child(1), .gm-control-active:active img:nth-child(1), .gm-control-active:active img:nth-child(2) {
    display: block
}