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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="stick">
  <div class="glow-1 hidden"></div>
  <div class="glow-2 hidden"></div>
</div>
<div class="container">
  <div class="top-row">
    <div class="note-group group-of-two group-1">
      <div class="note note-1" data-frequency="207.65"><div>G#</div></div>
      <div class="note note-2" data-frequency="233.08"><div>A#</div></div>
    </div>
    <div class="note-group group-of-two group-2">
      <div class="note note-3" data-frequency="277.18"><div>C#</div></div>
      <div class="note note-4" data-frequency="311.13"><div>D#</div></div>
    </div>
    <div class="note-group group-of-three group-3">
      <div class="note note-5" data-frequency="369.99"><div>F#</div></div>
      <div class="note note-6" data-frequency="415.30"><div>G#</div></div>
      <div class="note note-7" data-frequency="466.16"><div>A#</div></div>
    </div>
    <div class="note-group group-of-two group-4">
      <div class="note note-8" data-frequency="554.37"><div>C#</div></div>
      <div class="note note-9" data-frequency="622.25"><div>D#</div></div>
    </div>
    <div class="note-group group-of-three group-5">
      <div class="note note-10" data-frequency="739.99"><div>F#</div></div>
      <div class="note note-11" data-frequency="830.61"><div>G#</div></div>
      <div class="note note-12" data-frequency="932.33"><div>A#</div></div>
    </div>
  </div>
  <div class="bottom-row">
    <div class="note note-13" data-frequency="196.00"><div>G</div></div>
    <div class="note note-14" data-frequency="220.00"><div>A</div></div>
    <div class="note note-15" data-frequency="246.94"><div>B</div></div>
    <div class="note note-16" data-frequency="261.63"><div>C</div></div>
    <div class="note note-17" data-frequency="293.66"><div>D</div></div>
    <div class="note note-18" data-frequency="329.63"><div>E</div></div>
    <div class="note note-19" data-frequency="349.23"><div>F</div></div>
    <div class="note note-20" data-frequency="392.00"><div>G</div></div>
    <div class="note note-21" data-frequency="440.00"><div>A</div></div>
    <div class="note note-22" data-frequency="493.88"><div>B</div></div>
    <div class="note note-23" data-frequency="523.25"><div>C</div></div>
    <div class="note note-24" data-frequency="587.33"><div>D</div></div>
    <div class="note note-25" data-frequency="659.25"><div>E</div></div>
    <div class="note note-26" data-frequency="698.46"><div>F</div></div>
    <div class="note note-27" data-frequency="783.99"><div>G</div></div>
    <div class="note note-28" data-frequency="880.00"><div>A</div></div>
    <div class="note note-29" data-frequency="987.77"><div>B</div></div>
    <div class="note note-30" data-frequency="1046.50"><div>C</div></div>
  </div>
</div>
!

CSS 

              
                .container {
  margin: 0 auto;
  height: 100%;
  width: 588px;
  min-width: 588px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  .top-row {
    display: flex;
    position: relative;
    z-index: 2;
    .note-group {
      display: flex;
      justify-content: space-between;
      position: relative;
      top: 52px;
      &.group-of-two { width: 60px;  }
      &.group-of-three { width: 93px; }
      &.group-1 { margin-left: 17px; }
      &.group-2 { margin-left: 36px; }
      &.group-3 { margin-left: 42px; }
      &.group-4 { margin-left: 39px; }
      &.group-5 { margin-left: 38px; }
    }
    .note { margin-top: auto; }
  }
  .bottom-row {
    width: 100%;
    display: flex;
    justify-content: space-between;
    .note > div {
      display: flex;
      justify-content: center;
      align-items: flex-end;
    }
  }
}

.note {
  width: 27px;
  font-family: 'Roboto', sans-serif;
  font-weight: 900;
  font-size: 14px;
  line-height: 14px;
  color: #333333;
  text-align: center;
  perspective: 200px;
  user-select: none;
  & > div {
    background-image: linear-gradient(-180deg, #E9D5D0 0%, #E6E5F2 98%);
    box-shadow: 0px 2px 2px 0px rgba(0,0,0,0.26);
    border-radius: 3px;
    width: 100%;
    height: 100%;
    padding: 8px 0;
    box-sizing: border-box;  
    transform-origin: top center;
  }
  
  &:hover > div {
    background-image: linear-gradient(-180deg, #E3C377 3%, #ADDC9D 98%);
    transform: rotateX(-5deg);
  }
  
  &.note-1 { height: 183px; }
  &.note-2 { height: 178px; }
  &.note-3 { height: 168px; }
  &.note-4 { height: 163px; }
  &.note-5 { height: 153px; }
  &.note-6 { height: 148px; }
  &.note-7 { height: 143px; }
  &.note-8 { height: 133px; }
  &.note-9 { height: 128px; }
  &.note-10 { height: 118px; }
  &.note-11 { height: 113px; }
  &.note-12 { height: 108px; }
  
  &.note-13 { height: 183px; }
  &.note-14 { height: 178px; }
  &.note-15 { height: 173px; }
  &.note-16 { height: 168px; }
  &.note-17 { height: 163px; }
  &.note-18 { height: 158px; }
  &.note-19 { height: 153px; }
  &.note-20 { height: 148px; }
  &.note-21 { height: 143px; }
  &.note-22 { height: 138px; }
  &.note-23 { height: 133px; }
  &.note-24 { height: 128px; }
  &.note-25 { height: 123px; }
  &.note-26 { height: 118px; }
  &.note-27 { height: 113px; }
  &.note-28 { height: 108px; }
  &.note-29 { height: 103px; }
  &.note-30 { height: 98px; }
}

.stick {
  position: absolute;
  height: 117px;
  width: 22px;
  left: 100px;
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/355309/stick.svg);
  background-repeat: no-repeat;
  background-size: cover;
  z-index: 9999;
  transform-origin: 4px 50%;
  transform: rotate(-25deg);
  pointer-events: none;
  .glow-1, .glow-2 {
    border-radius: 50%;
    background-color: rgba(255, 243, 178, 0.25);
    position: relative;
    animation-name: bonyonyon;
    animation-timing-function: linear;
    animation-play-state: paused;
    animation-iteration-count: infinite;
    transition: opacity 0.3s ease;
    opacity: 1;
    &.hidden {
      opacity: 0;
    }
  }
  .glow-1 {
    width: 34px;
    height: 34px;
    left: -6px;
    top: -6px;
    z-index: 9997;
    animation-duration: 0.3s;
  }
  .glow-2 {
    width: 28px;
    height: 28px;
    left: -3px;
    top: -37px;
    z-index: 9998;
    animation-duration: 0.2s;
    animation-delay: .1s;
  }
}

body {
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/355309/background.svg);
  background-color: #583864;
  background-size: auto 100%;
  display: flex;
  align-items: center;
}

html {
  height: 100%;
}
body {
  min-height: 100%;
  margin: 0;
  cursor: none;
}

@keyframes bonyonyon {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.5);
  }
}
!

JS 

              
                class Sound {
  
  constructor(context) {
    this.context = context;
  }
  
  setup() {
    this.oscillator = this.context.createOscillator();
    this.gainNode = this.context.createGain();

    this.oscillator.connect(this.gainNode);
    this.gainNode.connect(this.context.destination);
    this.oscillator.type = 'sine';
  }

  play(value) {
    this.setup();

    this.oscillator.frequency.value = value;
    this.gainNode.gain.setValueAtTime(0, this.context.currentTime);
    this.gainNode.gain.linearRampToValueAtTime(1, this.context.currentTime + 0.01);
            
    this.oscillator.start(this.context.currentTime);
    this.stop(this.context.currentTime);
  }
  
  stop() {
    this.gainNode.gain.exponentialRampToValueAtTime(0.001, this.context.currentTime + 1);
    this.oscillator.stop(this.context.currentTime + 1);
  }
 
}

let context = new (window.AudioContext || window.webkitAudioContext)();


document.addEventListener('mousemove', cursor);
var stick = document.querySelector('.stick');
var glow1 = document.querySelector('.stick .glow-1');
var glow2 = document.querySelector('.stick .glow-2');
var notes = document.querySelectorAll('.note');

notes.forEach((note) => {
  note.addEventListener('mouseenter', () => {
    playSound(note);
    showGlow();
    setTimeout(hideGlow, 300);
  })
  note.addEventListener('mouseleave', hideGlow);
})

function playSound(note) {
  let sound = new Sound(context);
  let value = note.dataset.frequency;
  sound.play(value);
  sound.stop();
}

function showGlow() {
  glow1.style.animationPlayState = "running";
  glow2.style.animationPlayState = "running";
  glow1.classList.remove('hidden');
  glow2.classList.remove('hidden');
}

function hideGlow() {
  glow1.style.animationPlayState = "paused";
  glow2.style.animationPlayState = "paused";
  glow1.classList.add('hidden');
  glow2.classList.add('hidden');
}

function cursor(e) {
  stick.style.top = e.clientY - 12 + "px";
  stick.style.left = e.clientX + 12 + "px";
}
!
999px

Console