html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

body {
  --index: 0;
  --percent: 100%;
  --position-x: 0;
  --position-y: 0;

  background: #34495e;
}

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

button.item {
  left: calc((var(--position-x) + 0.1) * var(--percent) * 1%);
  top: calc((var(--position-y) + 0.1) * var(--percent) * 1%);
  width: calc(var(--percent) * 0.7vmin);
  height: calc(var(--percent) * 0.7vmin);
  border: calc(var(--percent) * 0.02vmin) solid black;
  box-shadow: 0 0 calc(var(--percent) * 0.2vmin) rgba(0, 0, 0, 0.4),
    calc(var(--percent) * -0.2vmin) calc(var(--percent) * 0.2vmin)
      calc(var(--percent) * 0.5vmin) rgba(0, 0, 0, 0.4);

  border-radius: 100%;
  position: absolute;
  padding: 0;
  margin: 0;
  cursor: pointer;
  overflow: hidden;
}

button.item:after {
  font-size: calc(var(--percent) * 0.3vmin);
  line-height: calc(var(--percent) * 0.3vmin);
  transform: rotate(calc(var(--index) * var(--percent) * 3.6deg));

  content: ":)";
  transform-origin: center;
  filter: invert(1);
  mix-blend-mode: difference;
  pointer-events: none;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

button.item:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    at 60% 40%,
    rgba(255, 255, 255, 0.4) 0%,
    rgba(0, 0, 0, 0.4) 60%,
    rgba(255, 255, 255, 0.4) 80%,
    rgba(0, 0, 0, 0.6) 100%
  );
  mix-blend-mode: multiply;
  transform-origin: center;
}

button.item.selected,
button.item.fade-out {
  border-color: white;
  box-shadow: 0 0 calc(var(--percent) * 0.5vmin) rgba(255, 255, 255, 1);
}

button.item.selected:after,
button.item.fade-out:after {
  line-height: calc(var(--percent) * 0.75vmin);
}

button.item.nope:after {
  content: ":D";
  animation: nope 2s forwards ease-in-out infinite;
}

button.item.fade-out {
  pointer-events: none;
  animation: fade-out 1.2s forwards ease-in-out;
}

button.item.fade-out:after {
  content: ":O";
}

@keyframes nope {
  0% {
    line-height: calc(var(--percent) * 0.3vmin);
  }

  25% {
    line-height: calc(var(--percent) * 1.2vmin);
  }

  50% {
    line-height: calc(var(--percent) * 0.3vmin);
  }

  75% {
    line-height: calc(var(--percent) * 1.2vmin);
  }

  100% {
    line-height: calc(var(--percent) * 0.3vmin);
  }
}

@keyframes fade-out {
  0% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}