body{
  background-color: rgb(255, 255, 255);
}

h1{
  font-weight: 900;
  font-size: 240px;
}

div.balle{
  width: 20px;
  height:20px;
  border-radius: 10px;
  background-color: black;
}

div.boule{
  position: absolute;
  width: 10px;
  height:10px;
  border-radius: 10px;
  background-color: red;
  background-blend-mode:screen;
}

div.carré{
  position: absolute;
  height: 1400px;
  width: 50px;
  border-radius: 5px;
  background-color: rgb(149, 155, 212);
}

div.cube{
  position: absolute;
  height: 1400px;
  width: 500px;
  border-radius: 0px;
  background-color: rgb(0, 0, 0);
  opacity: 100%;
  background-blend-mode:luminosity;
}