body{
  background: radial-gradient(blue, white);
  text-align: center;
}

#ball {
	width: 350px;
  height: 350px;
  background-color: black;
  align-content: center;
  border-radius: 50%;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

#circle{
  width: 185px;
  height: 185px;
  background-color: #FFF;
  border-radius: 50%;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  position: absolute;
  top: 25%;
  left: 25%;
  font-size: 2em; 
  color: blue;
}

button{
  background-color: blue;
  color: #FFF;
  padding: 1em;
  font-family: 'Roboto Condensed', sans-serif;
}

input{
  width: 20em;
  height: 2em;
}