body{
  background-color: aqua;
}

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;
}