/* MAIN PANEL */
#main-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

/* THREE.js CANVAS */
canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: -1; /* sotto a tutto */
  background: var(--test-bg-color);
}