#SoundButton, #Manual {
  background: #e8e8e8;
  border: 1px solid #e8e8e8;
  border-radius: 0.5em;
  box-shadow: 6px 6px 12px #c5c5c5, -6px -6px 12px #ffffff;
  color: blue;
  cursor: pointer;
  font-size: 20px;
  margin: 0px 50px 0px 50px;
  padding: 0.7em 1.7em;
  transition: all 0.3s;
}

#SoundButton:hover, #Manual:hover {
  background: #d8e5eb;
}

#SoundButton:active, #Manual:active {
  color: #666;
  box-shadow: inset 4px 4px 12px #c5c5c5, inset -4px -4px 12px #ffffff;
}