body {
    margin: 0;
    overflow: hidden;
}

canvas {
    display: block;
    background: black;
    width: 100%;
    height: 100%;
}

.controls {
    display: none;
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    justify-content: space-between;
    width: 80%;
}

.control-btn {
    display: none;
    padding: 10px;
    font-size: 18px;
    background-color: rgba(0, 0, 0, 0.6);
    color: white;
    border: 1px solid #fff;
    border-radius: 5px;
    cursor: pointer;
    flex-grow: 1;
    margin: 0 5px;
}

@media(max-width: 600px) {
    .control-btn {
        display: block;
        font-size: 16px;
        padding: 12px;
    }
}
