body {
  background-color:MediumSeaGreen;
  font-family: Helvetica, Arial, sans-serif;
}
button, .button {
  background-color: DarkSeaGreen;
  border-radius: 8px;
  width:20%;
  font-size:large;
  border-style: none;
  color: white;
  display: inline-block;
  margin: 0;
  text-align: center;
}

button:hover,
button:focus,
.button:hover,
.button:focus {
  background-color: seagreen;
}

footer {
  background-color: DarkSeaGreen;
  position: fixed;
  font-size: large;
  bottom: 0;
}