style.css

* {
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100vh;
  overflow: hidden;
  font-family: 'Sigmar One', cursive;
  font-size: 16px;
  line-height: 1.2;
}

#container {
  padding-top: 2rem;
  height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

#button-container {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  padding: 0 1rem;
}

button {
  display: block;
  justify-self: end;
  width: 7rem;
  height: 7rem;
  background: no-repeat;
  border: none;
  outline:none;
}

/* Added class */
.clicked-button {
  transform: scale(0.9);
  transition: all 0.2s;
}

#newGame {
  margin: 0 auto;
  font-weight: 900;
  font-size: 2rem;
  font-family: 'Sigmar One', cursive;
}

/* Animation for New Game button */
@keyframes scaling {
  10% {
      transform: scale(1.0);
  }
  100% {
      transform: scale(0.9);
  }
}

#newGame:hover {
  animation: scaling 0.2s infinite alternate;
}

/* Hiding button text */
.choice {
  background-size: contain;
  font-size: 0px;
}

#rock {
  background-image: url(img/stones.svg);
}

#paper {
  background-image: url(img/copy.svg);
}

#scissors {
  background-image: url(img/scissors.svg);
}

/* Added div */
#divScore {
  min-height: 10rem;
  text-align: center;
  font-size: 1.5rem;
}

#scoreResults {
  font-size: 2rem;
}

footer {
  width: 100%;
  left: 0;
  bottom: 0;
  display: flex;
  justify-content: space-between;
  align-content: flex-end;
}

footer div {
  padding: 0 .5rem;
}