#keypad {
  background-image: url(../img/keypad/keypad-yellow-bg.jpg);
  background-repeat: no-repeat;
  background-position: left top;
  background-size: 100% 100%;
}

#keypad tr td.keynum {
  vertical-align: middle;
  text-align: center;
  font-size: 60px;
  font-weight: bold;
  width: 120px;
  height: 120px;
  cursor: pointer;
  color: #378737;
}

#keypad tr td.keynum:hover {
  background-color: rgba(75, 109, 75, 0.2);
}

@media screen and (max-width: 700px),
screen and (max-height: 700px) {
  #keypad tr td.keynum {
    width: 100px;
    height: 100px;
  }
}

@media screen and (max-width: 700px),
screen and (max-height: 600px) {
  #keypad tr td.keynum {
    width: 80px;
    height: 80px;
  }
}

@media screen and (max-width: 600px),
screen and (max-height: 500px) {
  #keypad tr td.keynum {
    width: 60px;
    height: 60px;
  }
}

@media screen and (max-width: 500px),
screen and (max-height: 400px) {
  #keypad tr td.keynum {
    width: 50px;
    height: 50px;
  }
}

@media screen and (max-width: 500px),
screen and (max-height: 300px) {
  #keypad tr td.keynum {
    width: 40px;
    height: 40px;
  }
}