button
{
  background-color: #6B6;
  border: none;
  border-radius: 5px;
  box-shadow: 0 5px #343;
  outline: none;
}

button:hover
{
  background-color: #5C5;
  box-shadow: 0 5px #252;
}

button:active
{
  box-shadow: 0 2px #242;
  position: relative;
  top: 3px;
}