style.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  align-items: center;
  background: slategrey;
  display: flex;
  font-family: 'Ubuntu', sans-serif;
  justify-content: center;
  min-height: 100vh;
}

.game-container {
  background: white;
  border-radius: 12px;
  box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
  height: 450px;
  width: 500px;
}

header {
  align-items: center;
  background: coral;
  border-top-left-radius: 12px;
  border-top-right-radius: 12px;
  display: flex;
  height: 80px;
  justify-content: center;
}

h1 {
  color: whitesmoke;
}

.player-container,
.computer-container {
  display: grid;
  gap: 0px;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  margin-top: 40px;
  text-align: center;
}

h2 {
  grid-column-end: 4;
  grid-column-start: 1;
  grid-row-end: 2;
  grid-row-start: 1;
  margin-bottom: 20px;
}

.fa-hand-rock {
  grid-column-end: 2;
  grid-column-start: 1;
  grid-row-end: 3;
  grid-row-start: 2;
}

.fa-hand-paper {
  grid-column-end: 3;
  grid-column-start: 2;
  grid-row-end: 3;
  grid-row-start: 2;
}

.fa-hand-scissors {
  grid-column-end: 4;
  grid-column-start: 3;
  grid-row-end: 3;
  grid-row-start: 2;
}

.far {
  font-size: 3rem;
}

.player-container .far {
  color: indianred;
  cursor: pointer;
}

.computer-container .far {
  color: lightseagreen;
}

.selected {
  color: slategray !important;
}

.result-container {
  display: flex;
  justify-content: center;
  margin-top: 40px;
}