div {
  border: 1px solid black;
}

#display {
  text-align: right;
}

#keypad div {
  padding: 1em;
  display: inline-block;
  width: 2em;
}
#keypad div:hover {
  cursor: pointer;
}

#keypad #equals {
  width: 6.33em;
  background-color: skyblue;
}

#calculator {
  display: inline-block;
}