body {
    margin: 0px;
    height: 100vh;
}
canvas {
    display: block;
}

.nav-button {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    z-index: 1000;
}

.nav-button:hover {
    background-color: rgba(255, 255, 255, 1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.nav-button svg {
    width: 24px;
    height: 24px;
    color: #000;
    display: block; 
}

.nav-button svg path {
    vector-effect: non-scaling-stroke;
}

@media (max-width: 768px) {
    .nav-button {
        top: 10px;
        left: 10px;
        width: 36px;
        height: 36px;
    }
}