#game-option-btn-list {
  display: block;
  position: fixed;
  top: 0;
  right: 0;
  padding: 0;
  margin: 0;
  color: #303030;
  background-color: rgba(255,255,255,0.5);
}

#game-option-btn-list button {
  width: 40px;
  height: 40px;
  margin: 0;
  padding: 0;
  cursor: pointer;
  text-align: center;
  font-size: 18px;
  border: none;
}

#game-option-btn-list button:hover {
  color: white;
  background-color: rgba(0,0,0,0.5);
}