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HTML

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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.

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About Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <h1> Press the Keys Below:</h1>
<div class="notes">
  <div data-key="65" class="key">
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	 viewBox="0 0 55 55" style="enable-background:new 0 0 55 55;" xml:space="preserve">
      <path d="M52.66,0.249c-0.216-0.189-0.501-0.275-0.789-0.241l-31,4.011C20.373,4.084,20,4.507,20,5.01v6.017v4.212v25.384
	C18.174,38.428,15.273,37,12,37c-5.514,0-10,4.037-10,9s4.486,9,10,9s10-4.037,10-9c0-0.232-0.019-0.46-0.039-0.687
	C21.974,45.248,22,45.189,22,45.121V16.118l29-3.753v18.257C49.174,28.428,46.273,27,43,27c-5.514,0-10,4.037-10,9s4.486,9,10,9
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    </svg>
    <span>A</span>
  </div>
  <div data-key="83" class="key">
    <svg version="1.1" id="capa_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
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        c24.032,9.184,63.36,32.576,74.176,87.2c-2.016,2.976-3.936,6.176-6.176,8.736c-5.856,6.624-5.216,16.736,1.44,22.56
        c6.592,5.888,16.704,5.184,22.56-1.44c4.288-4.864,8.096-10.56,11.744-16.512C328.04,265.563,328.393,265.083,328.712,264.539z"/>
    </svg>
    <span>S</span>
  </div>
  <div data-key="68" class="key">
    <svg version="1.1" id="capa" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 viewBox="0 0 55 55" style="enable-background:new 0 0 55 55;" xml:space="preserve">
      <path d="M52.66,0.249c-0.216-0.189-0.501-0.275-0.789-0.241l-31,4.011C20.373,4.084,20,4.507,20,5.01v6.017v4.212v25.384
	C18.174,38.428,15.273,37,12,37c-5.514,0-10,4.037-10,9s4.486,9,10,9s10-4.037,10-9c0-0.232-0.019-0.46-0.039-0.687
	C21.974,45.248,22,45.189,22,45.121V16.118l29-3.753v18.257C49.174,28.428,46.273,27,43,27c-5.514,0-10,4.037-10,9s4.486,9,10,9
	c5.464,0,9.913-3.966,9.993-8.867c0-0.013,0.007-0.024,0.007-0.037V11.227V7.016V1C53,0.712,52.876,0.438,52.66,0.249z"/>
    </svg>
    <span>D</span>
  </div>
  <div data-key="70" class="key">
    <svg version="1.1" id="capa_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 viewBox="0 0 415.963 415.963" style="enable-background:new 0 0 415.963 415.963;" xml:space="preserve">
      <path d="M328.712,264.539c12.928-21.632,21.504-48.992,23.168-76.064c1.056-17.376-2.816-35.616-11.2-52.768
        c-13.152-26.944-35.744-42.08-57.568-56.704c-16.288-10.912-31.68-21.216-42.56-35.936l-1.952-2.624
        c-6.432-8.64-13.696-18.432-14.848-26.656c-1.152-8.32-8.704-14.24-16.96-13.76c-8.384,0.576-14.88,7.52-14.88,15.936v285.12
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    </svg>
    <span>F</span>
  </div>
  <div data-key="71" class="key">
    <svg version="1.1" id="capa" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 viewBox="0 0 55 55" style="enable-background:new 0 0 55 55;" xml:space="preserve">
      <path d="M52.66,0.249c-0.216-0.189-0.501-0.275-0.789-0.241l-31,4.011C20.373,4.084,20,4.507,20,5.01v6.017v4.212v25.384
	C18.174,38.428,15.273,37,12,37c-5.514,0-10,4.037-10,9s4.486,9,10,9s10-4.037,10-9c0-0.232-0.019-0.46-0.039-0.687
	C21.974,45.248,22,45.189,22,45.121V16.118l29-3.753v18.257C49.174,28.428,46.273,27,43,27c-5.514,0-10,4.037-10,9s4.486,9,10,9
	c5.464,0,9.913-3.966,9.993-8.867c0-0.013,0.007-0.024,0.007-0.037V11.227V7.016V1C53,0.712,52.876,0.438,52.66,0.249z"/>
    </svg>
    <span>G</span>
  </div>
  <div data-key="72" class="key">
    <svg version="1.1" id="capa_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
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      <path d="M328.712,264.539c12.928-21.632,21.504-48.992,23.168-76.064c1.056-17.376-2.816-35.616-11.2-52.768
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    </svg>
    <span>H</span>
  </div>
</div>

<div data-key="32" class="secret">
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</div>
!

CSS 

              
                * {
  box-sizing: border-box;
}
body {
  background: #f1f1f1;
  font-family: 'Roboto', sans-serif;
}
h1 {
  margin: 0;
  padding: 10px;
}
.notes {
  display: flex;
  justify-content: center;
  align-items: center;
  width: calc(100vw - 20px);
  height: calc(100vh - 56px);
}
.key {
  display: flex;
  flex-flow: column wrap;
  justify-content: center;
  align-items: center;
  transition: all 300ms ease;
  transform: scale(1);
  span {
    font-size: 24px;
    display: block;
    margin-top: 10px; 
  }
  svg {
    width: 60px;
    height: 60px;
    transform: scale(0);
  }
  &.active {
    transform: scale(1.1);
    svg {
      transform: scale(1);
    }
  }
}

.secret {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  transition: all 300ms ease;
  transform: scale(0);
  svg {
    width: 99vw;
    height: 99vh;
  }
  &.active {
    transform: scale(1);
  }
}
!

JS 

              
                function playNote(e) {
  const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
  if (!key) return;
  key.classList.toggle('active');
}

function removeTransition(e) {
  if (e.propertyName !== 'transform') return;
  this.classList.remove('active');
}

const keys = document.querySelectorAll('.key');
keys.forEach(key => key.addEventListener('transitionend', removeTransition));

window.addEventListener('keydown', playNote);


// Secret stuff for bonfire night

function firework(e) {
  const firewo = document.querySelector(`.secret[data-key="${e.keyCode}"]`);
  if (!firewo) return;
  firewo.classList.toggle('active');
}

const secrets = document.querySelectorAll('.secret');
secrets.forEach(key => key.addEventListener('transitionend', removeTransition));

window.addEventListener('keydown', firework);
!
999px

Console