/*
  display: flex;
  justify-content: center;
  align-items: center;
*/
body {
  padding: 0;
  margin: 0;
  background-color: #141414;
}
canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
}
#contenu {
  position: relative;
  z-index: 2;
}