#tubes-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0; /* Behind content but visible */
    pointer-events: none; /* Allow clicks to pass through to form */
}

/* Ensure content is above the canvas */
.main-content {
    position: relative;
    z-index: 1;
}