#d {
  font-size: 40px;
  color: black;
  font-family: arial;
}

button[data-action="INCREMENT"] {
  padding: 10px;
  background: green;
  color: white;
}

button[data-action="DECREMENT"] {
  padding: 10px;
  background: red;
  color: white;
}

button[data-action="RESET"] {
  padding: 10px;
  background: gray;
  color: white;
}

button[data-action="ADD_FOUR"] {
  padding: 10px;
  background: purple;
  color: white;
}

button[data-action="DOUBLE"] {
  padding: 10px;
  background: orange;
  color: white;
}