body {
    margin: 0;
    overflow: hidden;
    background-color: var(--background-color, #000);
    transition: background-color 0.3s;
}

canvas {
    display: block;
}

.back-link {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 100;
    background-color: var(--button-bg);
    color: var(--button-text);
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1em;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

@media (hover: hover) {
    .back-link:hover {
        background-color: var(--button-hover-bg);
        box-shadow: 0 4px 8px rgba(0,0,0,0.15);
    }
}

.back-link:active {
    background-color: var(--button-active-bg);
    transform: translateY(1px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}