style.css

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html,
body {
  height: 100%;
}

body {
  font-weight: 400;
  font-family: "Zilla Slab", serif;
  line-height: 1.5;
  position: relative;

  background-color: rgba(255, 255, 255, 0.87);
  background-image: url("groovepaper.png");
  color: #0b2999;
  border: 20px solid #b4cc1b;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Fredoka One", cursive;
  overflow-wrap: break-word;
  color: #0b2999;
}

a {
  font-weight: 600;
  color: #8d9942;
  text-decoration: inherit;
}
a:hover {
  color: #0b2999;
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
  margin-bottom: 10px;
}

h2 {
  font-size: 2em;
  line-height: 1.1;
}

#app {
  padding: 2rem;
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 10px;
  margin-top: 30px;
}

button {
  width: 100%;
  height: 100px;
  border: none;
  font-size: 2.4em;
  background-color: #b4cc1b42;
  cursor: pointer;
  transition: all 0.3s ease;
}

button:hover:enabled {
  border-color: #8d9942;
  background: #b4cc1b4f;
}

button:focus,
button:focus-visible {
  outline: none;
}

.pop {
  animation: pop 0.2s ease-in;
}

@keyframes pop {
  0% {
    opacity: 0;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.2);
  }
  100% {
    opacity: 1;
    transform: scale(1.1);
  }
}

p {
  margin-top: 10px;
}

button.playagain {
  font-size: 1.5em;
  cursor: pointer;
  border: none;
  background: #0b2999;
  color: #fff;
  height: auto;
  width: auto;
  padding: 10px 20px;
  display: inline-block;
}

button.playagain:hover {
  background-color: #ffd708;
  color: #0b2999;
}

#audio {
  display: inline-block;
  cursor: pointer;
  width: 30px;
  height: 30px;
}

.winner {
  background: #b4cc1b;
  animation: none;
}

.no-click {
  pointer-events: none;
}

input[type="checkbox"] {
  display: none;
}

input[type="checkbox"] + label {
  position: relative;
  padding-left: 30px;
  cursor: pointer;
}

input[type="checkbox"] + label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 18px;
  height: 18px;
  border: 2px solid #b4cc1b;
  border-radius: 4px;
}

input[type="checkbox"]:checked + label::before {
  background-color: #b4cc1b;
  border-color: #b4cc1b;
}

input[type="checkbox"]:checked + label::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 12px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.track-wrapper {
  font-size: 1.8rem;
}