body {background-color: rebeccapurple
}

div.balle{
width: 20px;
height: 20px;
border-radius: 70px;
background-color: rgba(194, 65, 65, 0.863);
}
div.boule{
    position:absolute;
    width: 70px;
    height: 500px;
    border-radius: 10px;
    background-color: rosybrown;
    opacity: 0.7;
    
  
}