#ball{ 
 width:150px;
 height:150px;
 padding:150px;
 background-color: black;
 color:white;
 border-radius:50% ;
 text-align:center;
 font-size: 100px;
 font-family: arial;
 margin: 0 auto;
}

h1{
  font-family:arial;
  text-align:center;
  font-size: 50px;
}
  

body{
  background-color:green
    
}

#controls{
  margin: 0 auto;
   text-align:center
}

#result { 
  font-size:20px;
  font-weight:bold;
  text-shadow: 2px 2px 5px blue;
}