html, body {
  height: 100%;
}

.navmenu {
  z-index: 1;
}

.canvas {
  position: relative; 
  z-index: 2;  
  height: 100%; 
  width: 100%;
  left: 0;
  padding: 0;
}

@media (min-width: 992px) {
  body {
    padding: 0;
  }
  .canvas {
    padding: 0;
  }
}