body{
    margin: 0;
    background: darkgray;
    overflow: hidden;
    text-align: center;
}

#myCanvas{
    background: lightgray;
}

#mobileControls {
    position: fixed;
    bottom: 20px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#mobileControls:not(.mobile-visible) {
    display: none;
}

#mobileControls button {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    background-color: rgba(0,0,0,0.5);
    color: white;
    font-size: 20px;
    margin: 5px;
    touch-action: manipulation;
}

#mobileControls div {
    display: flex;
    justify-content: center;
}

@media (max-width: 768px) {
    #mobileControls {
        display: flex;
    }
}