Creating "Piano Animation with sound" with HTML

<!DOCtype html>
<html>
<style>
  @import url("https://fonts.googleapis.com/css2?family=Birthstone&display=swap");
  *,
  *::before,
  *::after {
    padding: 0;
    margin: 0 auto;
    box-sizing: border-box;
  }
  
  body {
    font-family: "Birthstone", cursive;
    background-color: #111;
    color: #aaa;
    min-height: 100vh;
    display: grid;
    place-items: center;
    perspective: 1500px;
    overflow: hidden;
    font-size: 32px;
  }
  
  .text {
    position: fixed;
    left: 1em;
    top: 1em;
  }
  
  .scene {
    transform: rotateX(-20deg);
    transform-style: preserve-3d;
  }
  
  .xylophone {
    position: relative;
    transform: rotateX(90deg) translateZ(0em);
    transform-style: preserve-3d;
  }
  
  .key {
    position: absolute;
    left: var(--left);
    width: 1em;
    height: var(--height);
    background-color: #ddd;
    transform-style: preserve-3d;
    box-shadow: 0 0 0.5em #0007 inset;
  }
  
  .key:nth-child(1) {
    --left: -9.25em;
    --height: 8em;
  }
  
  .key:nth-child(2) {
    --left: -8em;
    --height: 7.68em;
  }
  
  .key:nth-child(3) {
    --left: -6.75em;
    --height: 7.3728em;
  }
  
  .key:nth-child(4) {
    --left: -5.5em;
    --height: 7.077888em;
  }
  
  .key:nth-child(5) {
    --left: -4.25em;
    --height: 6.79477248em;
  }
  
  .key:nth-child(6) {
    --left: -3em;
    --height: 6.5229815808em;
  }
  
  .key:nth-child(7) {
    --left: -1.75em;
    --height: 6.2620623176em;
  }
  
  .key:nth-child(8) {
    --left: -0.5em;
    --height: 6.0115798249em;
  }
  
  .key:nth-child(9) {
    --left: 0.75em;
    --height: 5.7711166319em;
  }
  
  .key:nth-child(10) {
    --left: 2em;
    --height: 5.5402719666em;
  }
  
  .key:nth-child(11) {
    --left: 3.25em;
    --height: 5.3186610879em;
  }
  
  .key:nth-child(12) {
    --left: 4.5em;
    --height: 5.1059146444em;
  }
  
  .key:nth-child(13) {
    --left: 5.75em;
    --height: 4.9016780586em;
  }
  
  .key:nth-child(14) {
    --left: 7em;
    --height: 4.7056109363em;
  }
  
  .key:nth-child(15) {
    --left: 8.25em;
    --height: 4.5173864988em;
  }
  
  .key::before {
    content: "";
    position: absolute;
    width: 0.5em;
    height: 100%;
    background-color: #777;
  }
  
  .key:nth-child(-n+7)::before {
    transform: rotateY(-90deg);
    right: 0;
    transform-origin: right;
  }
  
  .key:nth-child(n+8):nth-child(-n+15)::before {
    transform: rotateY(90deg);
    left: 0;
    transform-origin: left;
  }
  
  .key::after {
    content: "";
    position: absolute;
    left: 0;
    top: 100%;
    width: 100%;
    height: 0.5em;
    background-color: #aaa;
    transform: rotateX(-90deg);
    transform-origin: top;
    box-shadow: 0 0 0.5em #0007 inset;
  }
  
  .key:nth-child(n+16) {
    bottom: -1em;
    transform: translateZ(0.75em);
  }
  
  .key:nth-child(5n+16) {
    --left: -8.625em;
    --height: 6em;
  }
  
  .key:nth-child(5n+17) {
    --left: -7.375em;
    --height: 5.76em;
  }
  
  .key:nth-child(5n+18) {
    --left: -4.875em;
    --height: 5.5296em;
  }
  
  .key:nth-child(5n+19) {
    --left: -3.625em;
    --height: 5.308416em;
  }
  
  .key:nth-child(5n+20) {
    --left: -2.375em;
    --height: 5.09607936em;
  }
  
  .key:nth-child(5n+21) {
    --left: 0.125em;
    --height: 4.8922361856em;
  }
  
  .key:nth-child(5n+22) {
    --left: 1.375em;
    --height: 4.6965467382em;
  }
  
  .key:nth-child(5n+23) {
    --left: 3.875em;
    --height: 4.5086848686em;
  }
  
  .key:nth-child(5n+24) {
    --left: 5.125em;
    --height: 4.3283374739em;
  }
  
  .key:nth-child(5n+25) {
    --left: 6.375em;
    --height: 4.1552039749em;
  }
  
  .key:nth-child(5n+26) {
    --left: 8.875em;
    --height: 3.9889958159em;
  }
  
  .key:nth-child(5n+27) {
    --left: 10.125em;
    --height: 3.8294359833em;
  }
  
  .key:nth-child(5n+28) {
    --left: 12.625em;
    --height: 3.676258544em;
  }
  
  .key:nth-child(5n+29) {
    --left: 13.875em;
    --height: 3.5292082022em;
  }
  
  .key:nth-child(5n+30) {
    --left: 15.125em;
    --height: 3.3880398741em;
  }
  
  .key:nth-child(5n+31) {
    --left: 17.625em;
    --height: 3.2525182792em;
  }
  
  .key:nth-child(5n+32) {
    --left: 18.875em;
    --height: 3.122417548em;
  }
  
  .key:nth-child(5n+33) {
    --left: 21.375em;
    --height: 2.9975208461em;
  }
  
  .key:nth-child(5n+34) {
    --left: 22.625em;
    --height: 2.8776200122em;
  }
  
  .key:nth-child(5n+35) {
    --left: 23.875em;
    --height: 2.7625152117em;
  }
  
  .key:nth-child(n+16):nth-child(-n+21)::before {
    transform: rotateY(-90deg);
    right: 0;
    transform-origin: right;
  }
  
  .key:nth-child(n+22)::before {
    transform: rotateY(90deg);
    left: 0;
    transform-origin: left;
  }
  
  .keyShadow {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 1em;
    background-color: #0003;
    transform: translateZ(-0.75em);
    filter: blur(0.125em);
  }
  
  .balls,
  .ballShadows {
    transform-style: preserve-3d;
  }
  
  .ball {
    position: absolute;
    left: var(--left);
    bottom: 50vh;
    width: 0.6em;
    height: 0.6em;
    background-image: radial-gradient(circle at 50% 20%, hsl(var(--hue), 100%, 75%), #000);
    border-radius: 50%;
    -webkit-animation: ballDrop 4s var(--delay, 0s) forwards, ballZ 4s var(--delay, 0s) ease-in-out forwards;
    animation: ballDrop 4s var(--delay, 0s) forwards, ballZ 4s var(--delay, 0s) ease-in-out forwards;
  }
  
  @-webkit-keyframes ballDrop {
    0% {
      bottom: 15em;
      -webkit-animation-timing-function: ease-in;
      animation-timing-function: ease-in;
    }
    40% {
      bottom: var(--bottom);
      -webkit-animation-timing-function: ease-out;
      animation-timing-function: ease-out;
    }
    55% {
      bottom: 5em;
      -webkit-animation-timing-function: ease-in;
      animation-timing-function: ease-in;
    }
    100% {
      bottom: -30em;
    }
  }
  
  @keyframes ballDrop {
    0% {
      bottom: 15em;
      -webkit-animation-timing-function: ease-in;
      animation-timing-function: ease-in;
    }
    40% {
      bottom: var(--bottom);
      -webkit-animation-timing-function: ease-out;
      animation-timing-function: ease-out;
    }
    55% {
      bottom: 5em;
      -webkit-animation-timing-function: ease-in;
      animation-timing-function: ease-in;
    }
    100% {
      bottom: -30em;
    }
  }
  
  @-webkit-keyframes ballZ {
    0%,
    40% {
      transform: translateX(0.2em) translateZ(var(--tz)) rotateX(20deg);
    }
    100% {
      transform: translateX(0.2em) translateZ(var(--tz)) rotateX(20deg) translateZ(50em);
    }
  }
  
  @keyframes ballZ {
    0%,
    40% {
      transform: translateX(0.2em) translateZ(var(--tz)) rotateX(20deg);
    }
    100% {
      transform: translateX(0.2em) translateZ(var(--tz)) rotateX(20deg) translateZ(50em);
    }
  }
  
  .ball:nth-child(1) {
    --hue: 0;
  }
  
  .ball:nth-child(2) {
    --hue: 42;
  }
  
  .ball:nth-child(3) {
    --hue: 84;
  }
  
  .ball:nth-child(4) {
    --hue: 126;
  }
  
  .ball:nth-child(5) {
    --hue: 168;
  }
  
  .ball:nth-child(6) {
    --hue: 210;
  }
  
  .ball:nth-child(7) {
    --hue: 252;
  }
  
  .ball:nth-child(8) {
    --hue: 294;
  }
  
  .ball:nth-child(9) {
    --hue: 336;
  }
  
  .ball:nth-child(10) {
    --hue: 378;
  }
  
  .ball:nth-child(11) {
    --hue: 420;
  }
  
  .ball:nth-child(12) {
    --hue: 462;
  }
  
  .ball:nth-child(13) {
    --hue: 504;
  }
  
  .ball:nth-child(14) {
    --hue: 546;
  }
  
  .ball:nth-child(15) {
    --hue: 588;
  }
  
  .ball:nth-child(16) {
    --hue: 630;
  }
  
  .ball:nth-child(17) {
    --hue: 672;
  }
  
  .ball:nth-child(18) {
    --hue: 714;
  }
  
  .ball:nth-child(19) {
    --hue: 756;
  }
  
  .ball:nth-child(20) {
    --hue: 798;
  }
  
  .ball:nth-child(21) {
    --hue: 840;
  }
  
  .ball:nth-child(22) {
    --hue: 882;
  }
  
  .ball:nth-child(23) {
    --hue: 924;
  }
  
  .ball:nth-child(24) {
    --hue: 966;
  }
  
  .ball:nth-child(25) {
    --hue: 1008;
  }
  
  .ball:nth-child(26) {
    --hue: 1050;
  }
  
  .ball:nth-child(27) {
    --hue: 1092;
  }
  
  .ball:nth-child(28) {
    --hue: 1134;
  }
  
  .ball:nth-child(29) {
    --hue: 1176;
  }
  
  .ball:nth-child(30) {
    --hue: 1218;
  }
  
  .ball:nth-child(31) {
    --hue: 1260;
  }
  
  .ball:nth-child(32) {
    --hue: 1302;
  }
  
  .ball:nth-child(33) {
    --hue: 1344;
  }
  
  .ball:nth-child(34) {
    --hue: 1386;
  }
  
  .ball:nth-child(35) {
    --hue: 1428;
  }
  
  .ballShadow {
    position: absolute;
    left: var(--left, 0);
    bottom: var(--bottom);
    width: 1em;
    height: 1em;
    background-color: #000;
    border-radius: 50%;
    transform: translateZ(var(--tz)) rotateX(90deg) translateZ(-0.5em) scale(0.5);
    filter: blur(0.5em);
    opacity: 0;
    -webkit-animation: shadow 4s var(--delay, 0s) forwards;
    animation: shadow 4s var(--delay, 0s) forwards;
  }
  
  @-webkit-keyframes shadow {
    0%,
    35%,
    55%,
    100% {
      opacity: 0;
      -webkit-animation-timing-function: ease-in;
      animation-timing-function: ease-in;
    }
    40% {
      opacity: 1;
      -webkit-animation-timing-function: ease-out;
      animation-timing-function: ease-out;
    }
  }
  
  @keyframes shadow {
    0%,
    35%,
    55%,
    100% {
      opacity: 0;
      -webkit-animation-timing-function: ease-in;
      animation-timing-function: ease-in;
    }
    40% {
      opacity: 1;
      -webkit-animation-timing-function: ease-out;
      animation-timing-function: ease-out;
    }
  }
  
  .ball,
  .ballShadow {
    --bottom: 0;
    --tz: 2em;
  }
  
  .ball:nth-child(2),
  .ball:nth-child(4),
  .ball:nth-child(15),
  .ball:nth-child(20),
  .ball:nth-child(22),
  .ballShadow:nth-child(2),
  .ballShadow:nth-child(4),
  .ballShadow:nth-child(15),
  .ballShadow:nth-child(20),
  .ballShadow:nth-child(22) {
    --bottom: 0.75em;
    --tz: -0.5em;
  }
  
  .ball:nth-child(1),
  .ballShadow:nth-child(1) {
    --left: 2em;
    --delay: 0.66s;
  }
  
  .ball:nth-child(2),
  .ballShadow:nth-child(2) {
    --left: 1.375em;
    --delay: 1.01s;
  }
  
  .ball:nth-child(3),
  .ballShadow:nth-child(3) {
    --left: 2em;
    --delay: 1.3s;
  }
  
  .ball:nth-child(4),
  .ballShadow:nth-child(4) {
    --left: 1.375em;
    --delay: 1.61s;
  }
  
  .ball:nth-child(5),
  .ballShadow:nth-child(5) {
    --left: 2em;
    --delay: 1.905s;
  }
  
  .ball:nth-child(6),
  .ballShadow:nth-child(6) {
    --left: -1.75em;
    --delay: 2.145s;
  }
  
  .ball:nth-child(7),
  .ballShadow:nth-child(7) {
    --left: 0.75em;
    --delay: 2.416s;
  }
  
  .ball:nth-child(8),
  .ballShadow:nth-child(8) {
    --left: -0.5em;
    --delay: 2.713s;
  }
  
  .ball:nth-child(9),
  .ballShadow:nth-child(9) {
    --left: -3em;
    --delay: 3.009s;
  }
  
  .ball:nth-child(10),
  .ballShadow:nth-child(10) {
    --left: -9.25em;
    --delay: 3.976s;
  }
  
  .ball:nth-child(11),
  .ballShadow:nth-child(11) {
    --left: -6.75em;
    --delay: 4.256s;
  }
  
  .ball:nth-child(12),
  .ballShadow:nth-child(12) {
    --left: -3em;
    --delay: 4.52s;
  }
  
  .ball:nth-child(13),
  .ballShadow:nth-child(13) {
    --left: -1.75em;
    --delay: 4.796s;
  }
  
  .ball:nth-child(14),
  .ballShadow:nth-child(14) {
    --left: -6.75em;
    --delay: 5.634s;
  }
  
  .ball:nth-child(15),
  .ballShadow:nth-child(15) {
    --left: -3.625em;
    --delay: 5.919s;
  }
  
  .ball:nth-child(16),
  .ballShadow:nth-child(16) {
    --left: -1.75em;
    --delay: 6.189s;
  }
  
  .ball:nth-child(17),
  .ballShadow:nth-child(17) {
    --left: -0.5em;
    --delay: 6.494s;
  }
  
  .ball:nth-child(18),
  .ballShadow:nth-child(18) {
    --left: -6.75em;
    --delay: 7.366s;
  }
  
  .ball:nth-child(19),
  .ballShadow:nth-child(19) {
    --left: 2em;
    --delay: 7.677s;
  }
  
  .ball:nth-child(20),
  .ballShadow:nth-child(20) {
    --left: 1.375em;
    --delay: 7.949s;
  }
  
  .ball:nth-child(21),
  .ballShadow:nth-child(21) {
    --left: 2em;
    --delay: 8.26s;
  }
  
  .ball:nth-child(22),
  .ballShadow:nth-child(22) {
    --left: 1.375em;
    --delay: 8.515s;
  }
  
  .ball:nth-child(23),
  .ballShadow:nth-child(23) {
    --left: 2em;
    --delay: 8.792s;
  }
  
  .ball:nth-child(24),
  .ballShadow:nth-child(24) {
    --left: -1.75em;
    --delay: 9.074s;
  }
  
  .ball:nth-child(25),
  .ballShadow:nth-child(25) {
    --left: 0.75em;
    --delay: 9.367s;
  }
  
  .ball:nth-child(26),
  .ballShadow:nth-child(26) {
    --left: -0.5em;
    --delay: 9.649s;
  }
  
  .ball:nth-child(27),
  .ballShadow:nth-child(27) {
    --left: -3em;
    --delay: 9.944s;
  }
  
  .ball:nth-child(28),
  .ballShadow:nth-child(28) {
    --left: -9.25em;
    --delay: 10.81s;
  }
  
  .ball:nth-child(29),
  .ballShadow:nth-child(29) {
    --left: -6.75em;
    --delay: 11.088s;
  }
  
  .ball:nth-child(30),
  .ballShadow:nth-child(30) {
    --left: -3em;
    --delay: 11.37s;
  }
  
  .ball:nth-child(31),
  .ballShadow:nth-child(31) {
    --left: -1.75em;
    --delay: 11.677s;
  }
  
  .ball:nth-child(32),
  .ballShadow:nth-child(32) {
    --left: -6.75em;
    --delay: 12.595s;
  }
  
  .ball:nth-child(33),
  .ballShadow:nth-child(33) {
    --left: -0.5em;
    --delay: 12.883s;
  }
  
  .ball:nth-child(34),
  .ballShadow:nth-child(34) {
    --left: -1.75em;
    --delay: 13.169s;
  }
  
  .ball:nth-child(35),
  .ballShadow:nth-child(35) {
    --left: -3em;
    --delay: 13.493s;
  }
</style>

<body>
  <audio autoplay>
  <source src="https://assets.codepen.io/1948355/FurElise.mp3" type="audio/mpeg">
</audio>

  <div class="text">
    Turn on your speakers
  </div>

  <div class="scene">

    <div class="xylophone">
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
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      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
      <div class="key">
        <div class="keyShadow"></div>
      </div>
    </div>

    <div class="balls">
      <div class="ball"></div>
      <div class="ball"></div>
      <div class="ball"></div>
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<h1>
   <span>MADE BY DEVANSH MISHRA</span>
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