html,
body,
#canvas {
    height: 100%;
    padding: 0px;
    margin: 0;
}

#canvas {
    padding-top: 3rem;
}

#navbar {
  position: fixed;  
  z-index: 100;
  width: 100%;
  height: 3rem;
  text-align: center;
  vertical-align: middle;
  line-height: 3rem;
  top: 0px;
  padding-left: 1rem;
}