#canvas {
  display: block;
  width: 100%;
  height: 100%!important;
  margin: 0 auto;
  background-color: black;
  position: fixed;
  z-index: -1;
    top: 0!important;
}

#sec-c510 {
  background: transparent;
  position: relative;
  z-index: 999!important;
  margin-top: 25vh;
  margin-bottom: 25vh;
}