body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  text-transform: uppercase;
  letter-spacing: .25rem;
  font-family: 'Roboto', Helvetica, Arial, sans-serif;
  background: #ee9ca7;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to bottom, #ffdde1, #ee9ca7);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to bottom, #ffdde1, #ee9ca7); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
    }

#whack-a-mole {
  background-color: seagreen;
  border: solid 12px #000;
  padding: 20px;
  margin: 10px;
  width: 380px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.hole {
  background-image: url("images/hole.png");
  background-size: contain;
  width: 110px;
  height: 123px;
  margin: 5px;
}

.mole {
  background-image: url("images/mole.png");
}