<main class="card-container">
  <div class="card square-card">
    <div class="down">
      <div class="up">
        <div class="squeeze">
          <div class="rotate-in">
            <div class="rotate-out">
              <div class="square"></div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
  <div class="card ball-bouncing">
    <div class="ball"></div>
  </div>
  <div class="card ball-movement">
    <div class="ball"></div>
  </div>
  <div class="card counter"></div>
</main>

:root {
  --alabaster: #FAFAFA;
  --frangipani: #FFDCB5;
  --frostee: #EAF7EB;
  --lemon-chiffon: #F9EEAB;
  --sundown: #FFB7BC;
  --white: #FFF;
}

*,
::after,
::before {
  box-sizing: border-box;
  font-family: sans-serif;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--alabaster);
  min-height: 100vh;
  width: 100%;
}

.card-container {
  display: grid;
  grid-gap: 2rem;
  grid-template-columns: repeat(auto-fill, minmax(23rem, 1fr));
  margin: 0 auto;
  max-width: 100%;
  padding: 2rem;
  width: 55rem;
}

.card {
  align-items: center;
  border-radius: 0.25rem;
  box-shadow: 2px 3px 4px rgba(0, 0, 0, 0.25);
  display: flex;
  height: 23rem;
  justify-content: center;
  position: relative;
  width: 100%;
}

.ball {
  background-color: var(--white);
  border-radius: 50%;
  height: 3rem;
  position: absolute;
  width: 3rem;
}

/* Square */
.square-card {
  background-color: var(--frostee);
}

.square-card::before {
  animation: shadow 1.6s ease-in-out infinite both;
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 50%;
  bottom: 2rem;
  box-shadow: 0 0 0 8px rgba(0, 0, 0, 0.2);
  content: '';
  height: 0.1rem;
  left: 25%;
  position: absolute;
  right: 25%;
}

.down {
  animation: down 1.6s ease-in infinite both;
  bottom: 2rem;
  position: absolute;
}

.down .up {
  animation: up 1.6s ease-in-out infinite both;
}

.down .up .squeeze {
  animation: squeeze 1.6s cubic-bezier(0.72, 0.03, 0.28, 0.97) infinite both;
  transform-origin: 50% 100%;
}

.down .up .squeeze .rotate-in {
  animation: rotate-in 1.6s ease-out infinite both;
}

.down .up .squeeze .rotate-in .rotate-out {
  animation: rotate-out 1.6s ease-in infinite both;
}

.square {
  background-color: var(--white);
  height: 5rem;
  width: 5rem;
}

@keyframes down {
  0% {
    transform: translateY(-10rem);
  }
  20%,
  100% {
    transform: translateY(0);
  }
}

@keyframes up {
  0%,
  75% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-10rem);
  }
}

@keyframes squeeze {
  0%,
  4% {
    transform: scale(1);
  }
  45% {
    transform: scale(1.8, 0.4);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes rotate-in {
  0% {
    transform: rotate(-135deg);
  }
  20%,
  100% {
    transform: rotate(0deg);
  }
}

@keyframes rotate-out {
  0%,
  80% {
    transform: rotate(0);
  }
  100% {
    transform: rotate(135deg);
  }
}

@keyframes shadow {
  0%,
  100% {
    transform: scaleX(0.3);
  }
  45%,
  50% {
    transform: scaleX(0.8);
  }
}
/* End square */

/* Ball bouncing */
.ball-bouncing {
  background-color: var(--lemon-chiffon);
}

.ball-bouncing::before {
  animation: shadowBouncing 1.2s ease-in infinite;
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 1rem;
  bottom: 2rem;
  content: '';
  height: 0.15rem;
  position: absolute;
  width: 2rem;
}

.ball-bouncing .ball {
  animation: ballBouncing 1.2s ease-in infinite;
  bottom: 2.1rem;
  transform-origin: bottom;
}

@keyframes ballBouncing {
  0%,
  100% {
    transform: scale(1.5, 0.5);
  }
  20% {
    transform: scaleY(1.2);
  }
  40%,
  80% {
    transform: translateY(-14rem);
  }
  70% {
    transform: translateY(-15rem);
  }
  90% {
    transform: translateY(0);
  }
}

@keyframes shadowBouncing {
  0%,
  100% {
    transform: scale(2, 0.8);
  }
  20% {
    transform: scale(1.2, 0.8);
  }
  40%,
  80% {
    transform: scale(0.5, 0.2);
  }
  70% {
    transform: scale(0.5, 0.15);
  }
  90% {
    transform: scale(1.5, 0.6);
  }
}
/* End ball bouncing */

/* Ball movement */
.ball-movement {
  background-color: var(--frangipani);
  overflow: hidden;
}

.ball-movement::before {
  background-color: rgba(0, 0, 0, 0.15);
  border-radius: 1rem;
  bottom: 2rem;
  content: '';
  height: 0.15rem;
  left: 2rem;
  position: absolute;
  right: 2rem;
}

.ball-movement .ball {
  animation: ballMovement 1.6s cubic-bezier(0, 0.98, 1, 0.99) infinite;
  bottom: 2.1rem;
  transform: translate(14rem, -15rem) scale(1.2, 0.5);
  transform-origin: bottom;
}

@keyframes ballMovement {
  0% {
    transform: translate(14rem, -15rem);
  }
  15% {
    transform: translate(7rem, 0rem) scale(1.2, 0.5);
  }
  30% {
    transform: translate(2rem, -10rem) scale(1, 1);
  }
  45% {
    transform: translate(-2rem, 0rem) scale(1.2, 0.8);
  }
  60% {
    transform: translate(-5rem, -5.5rem) scale(1, 1);
  }
  75% {
    transform: translate(-8rem, 0rem) scale(1.1, 0.9);
  }
  100% {
    transform: translate(-14rem, -3rem) scale(1, 1);
  }
}
/* End ball movement */

/* Counter */
.counter {
  animation: counter 5s linear infinite alternate;
  background-color: var(--sundown);
  counter-reset: count 0;
}

.counter::before {
  color: var(--white);
  content: counter(count);
  font-size: 7rem;
  line-height: 1.1;
  text-shadow: 1px 2px 3px rgba(0, 0, 0, 0.3);
}

@keyframes counter {
  0% {
    counter-increment: count 0;
  }
  10% {
    counter-increment: count 1;
  }
  20% {
    counter-increment: count 2;
  }
  30% {
    counter-increment: count 3;
  }
  40% {
    counter-increment: count 4;
  }
  50% {
    counter-increment: count 5;
  }
  60% {
    counter-increment: count 6;
  }
  70% {
    counter-increment: count 7;
  }
  80% {
    counter-increment: count 8;
  }
  90% {
    counter-increment: count 9;
  }
  100% {
    counter-increment: count 10;
  }
}
/* End counter */