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HTML 

              
                - const rand = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min
- const notes = ['c', 'd', 'e', 'f', 'g', 'a', 'b', 'c2']

mixin note(note, i)
  - let h = rand(0, 360)
  - let sound = note === 'c2' ? 2 : note
  .note(style=`--h: ${--h}; --i: ${--i};` class=`note-${note}` data-key=`${sound}`)
    kbd #{note}

main
  .xylophone
    each note, index in notes
      - let sound = note === 'c2' ? 2 : note
      +note(note, index)
      audio(data-key=`${sound}` src=`https://s3-us-west-2.amazonaws.com/s.cdpn.io/1312918/${sound}.wav`)
  p Press letters on keyboard or click to play sounds
    br
    span (press 2 for c2)
    br
  p.license
    a 	&copy; Xylophone Sounds by 
    a(href="https://freesound.org/people/DANMITCH3LL/sounds") DANMITCH3LL is licensed under
     a(href="https://creativecommons.org/licenses/by/3.0/")  CC BY 3.0
!

CSS 

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

:root {
  --desired-size: 40;
  --coefficient: 1vmin;
  --size: calc(var(--desired-size) * var(--coefficient));
}

body {
  background-image: linear-gradient(120deg, #fdfbfb 0%, #ebedee 100%);
  height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  font-family: sans-serif;
}

main {
  margin: 0;
}

.xylophone {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  height: calc(1.2 * var(--size));
  width: calc(2.5 * var(--size));
  margin: 0 auto;
}

.xylophone > .note:before,
.xylophone > .note:after,
.xylophone:before,
.xylophone:after{
  position: absolute;
  content: '';
}

.xylophone:before,
.xylophone:after {
  height: 30px;
  z-index: -1;
  width: 100%;
  left: 0;
  background-image: linear-gradient(to right, #434343 0%, black 100%);
}

.xylophone:before {
  top: 10%;
  transform: rotate(4deg);
}

.xylophone:after {
  bottom: 10%;
  transform: rotate(-4deg);
}

.xylophone .note {
  --primary-color: hsla(var(--h, 0), 100%, 50%, 1);
  --offset: calc(var(--i, 0) * 4%); 
  position: relative;
  height: calc(110% - var(--offset));
  width: 10%;
  background: var(--primary-color);
  border-radius: 5px;
  transform: translateY(-15px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  transition: all 1s ease;
}

.xylophone > .note:before,
.xylophone > .note:after {
  left: 50%;
  transform: translateX(-50%);
  height: 15px;
  width: 15px;
  border-radius: 50%;
  background-image: linear-gradient(120deg, #fdfbfb 0%, #ebedee 100%);
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
}

.xylophone > .note:before {
  top: 10px;
}

.xylophone > .note:after {
  bottom: 10px;
}

.xylophone kbd {
    height: 100%;
    width: 100%;
    color: #FFF;
    font-size: 2em;
    display: flex;
    align-items: center;
    justify-content: center;
    text-shadow: 2px 2px #000;
    transition: border 0.2s ease;
}

.xylophone kbd:hover,
.xylophone kbd:focus {
  border: 3px solid #ffc600;
  cursor: pointer;
}

.xylophone > .note.playing {
  border-color: #ffc600;
  box-shadow: 10px -5px 2rem #FFC600;
}

main > p {
  text-align: center;
  font-size: 5vmin;
  width: 100vw;
}

main p.license {
  font-size: 2vmin;
  bottom: 10px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-weight: grey;
  opacity: 0.7;
}

main span {
  font-style: italic;
  font-weight: light;
  font-size: 0.75em;
}

main a {
  text-decoration: none;
}
!

JS 

              
                function removeStyles(e) {
  if (e.propertyName !== 'box-shadow') return;
  e.target.classList.remove('playing');
}

function playSound(e) {
  let dataKey = e.key;
  if (!dataKey) {
    dataKey = e.target.textContent === 'c2' ? 2 : e.target.textContent;
  }
  
  const audio = document.querySelector(`audio[data-key="${dataKey}"]`);
  const key = document.querySelector(`.note[data-key="${dataKey}"]`);
  if (!audio) return;

  key.classList.add('playing');
  audio.currentTime = 0;
  audio.play();
}

const keys = Array.from(document.querySelectorAll('.note'));
keys.forEach(key => key.addEventListener('transitionend', removeStyles));
window.addEventListener('keydown', playSound);
window.addEventListener('click', playSound);


// Xylophone Sounds Attribution - Sounds I used in this demo are not mine.
// Author: DANMITCH3LL
// Author URL: https://freesound.org/people/DANMITCH3LL/sounds
// License: Creative Commons Attribution 3.0 Unported
// License URL: http://creativecommons.org/licenses/by/3.0/
!
999px

Console