Bouncing ball animation - linear() easing

<div class="floor">
  <img src="img/football.webp" class="ball" alt="a shiny leather football with white and black hexagonal patches" fetchpriority="high">
</div>

:root {
  --easeOutBounce: linear(
    /* Start to 1st bounce */ 0,
    0.063,
    0.25,
    0.563,
    1 36.4%,
    /* 1st to 2nd bounce */ 0.812,
    0.75,
    0.813,
    1 72.7%,
    /* 2nd to 3rd bounce */ 0.953,
    0.938,
    0.953,
    1 90.9%,
    /* 3rd bounce to end */ 0.984,
    1 100% 100%
  );

  --animation-duration: 2s;
  --animation-delay: 1s;
}

body {
  height: 100dvh;
  margin: 0;

  display: grid;
  place-items: center;
}

.ball {
  height: 25vmin;
  width: 25vmin;

  translate: 0 -100dvh;

  animation: drop var(--animation-duration) infinite;
  animation-timing-function: var(--easeOutBounce);
  animation-delay: var(--animation-delay);
}

@keyframes drop {
  to {
    translate: 0;
  }
}

.floor {
  position: relative;
}

.floor::after {
  content: "";
  position: absolute;
  bottom: 0;
  width: 80%;
  height: 10%;

  background: radial-gradient(hsl(0 0% 10% / 0.5), hsl(0 0% 10% / 0.1));
  border-radius: 50%;
  z-index: -1;
  left: 50%;
  translate: -50% 50%;
  scale: 0;

  animation: show var(--animation-duration) infinite;

  animation-timing-function: var(--easeOutBounce);
  animation-delay: var(--animation-delay);
}

@keyframes show {
  to {
    scale: 1;
  }
}