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HTML

              
                <div id="root"></div>

<!-- <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script> -->
              
            
!

CSS

              
                * {
  box-sizing: border-box;
}

body {
  background-image: url("https://raw.githubusercontent.com/paul-duvall/website_images/master/white-waves.png");
  background-size: repeat;
}

#drum-machine {
  background-image: linear-gradient(to right, rgba(250, 112, 154, 0.6) 0%, rgba(254, 225, 64, 0.6) 100%);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  width: 600px;
  height: 500px;
  border-radius: 5px;
  flex-direction: row;
}

.drum-machineOff {
  background-image: linear-gradient(to right, rgba(213, 213, 213, 0.8) 0%, rgba(213, 213, 213, 0.8) 100%);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  width: 600px;
  height: 500px;
  border-radius: 5px;
}

#drum-keys {
  display: flex;
  flex-wrap: wrap;
  padding: 10px;
}

.drum-pad {
  width: 90px;
  margin: 10px;
  border-radius: 5px;
  border: none;
  font-size: 25px;
  background-color: #F7F5DD;
  color: grey;
  transition: all 0.1s ease;
}

.playing {
  transform: scale(1.1);
  border-color: #744267;
  background: #6dc06644;
  box-shadow: 0 0 1rem #744267;
  color: white;
}

#display {
  margin-top: 20px;
  margin-right: 20px;
  text-align: center;
  position: relative;
}

h1 {
  font-family: 'Overpass Mono', monospace;
  position: absolute;
  bottom: 15px;
  right: 10px;
  text-align: right;
  font-size: 45px;
  margin: 0;
  color: rgba(250, 112, 154, 0.6);
  text-shadow: 0 0 12px rgba(250, 112, 154, 0.6);
  -webkit-text-fill-color: rgba(254, 225, 64, 0.6);
  -webkit-text-stroke-width: 2px;
  -webkit-text-stroke-color: rgba(250, 112, 154, 0.6);
}

/* Screen displaying the current sound being played */
.displayScreen {
  border-radius: 5px;
  width: 150px;
  height: 75px;
  margin: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: uppercase;
  color: grey;
  font-size: 20px;
}

.displayScreenOn {
  box-shadow: 0 0 10px 2px #F3F3F3;
  background: #F7F7F7;
}

/* Applied when drum machine is off to dull screen */
.displayScreenOff {
  background: #E5E5E5;
  box-shadow: none;
}

/* On / off button */
#onButton {
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding-right: 20px;
  margin-top: 40px;
  color: grey;
}

/* Box around the slider */
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(250, 112, 154, 0.6);
  transition: .4s;
  border-radius: 5px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: #F7F5DD;
  transition: .4s;
  border-radius: 5px;
}

input:checked + .slider {
  background-color: rgba(133, 154, 183, 0.6);
}

input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  transform: translateX(26px);
}

/* Tablet view */
@media only screen and (max-width: 630px) {
  #drum-machine {
    height: auto; 
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 90%;
  }
  
  .drum-machineOff {
    height: 100vh; 
    width: 100%;
  }
  
  #drum-keys {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding: 10px;
  }
  
  .drum-pad {
    width: 90px;
    margin: 10px;
    padding-top: 20px;
    padding-bottom: 20px;
    font-size: 20px;
  }
  
  #display {
    margin-top: 0;
    margin-right: 0;
    text-align: center;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  #onButton {
    width: 50%;
    padding-right: 0;
    margin-top: 10px;
    margin-bottom: 25px;
  }
  
  h1 {
    position: static;
  }
}

/* Mobile view */
@media only screen and (max-width: 400px) {  
  #drum-keys {
    padding: 5px;
  }
  
  .drum-pad {
    width: 70px;
    margin: 8px;
    padding-top: 18px;
    padding-bottom: 18px;
    font-size: 18px;
  }
}
              
            
!

JS

              
                const sounds = [
  {
    name: 'Heater-1',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Heater-1.mp3',
    letter: 'Q',
    keycode: 113
  },
  {
    name: 'Heater-2',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Heater-2.mp3',
    letter: 'W',
    keycode: 119
  },
  {
    name: 'Heater-3',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Heater-3.mp3',
    letter: 'E',
    keycode: 101
  },
  {
    name: 'Heater-4',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Heater-4_1.mp3',
    letter: 'A',
    keycode: 97
  },
  {
    name: 'Clap',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Heater-6.mp3',
    letter: 'S',
    keycode: 115
  },
  {
    name: 'Open-HH',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Dsc_Oh.mp3',
    letter: 'D',
    keycode: 100
  },
  {
    name: 'Kick-n-Hat',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Kick_n_Hat.mp3',
    letter: 'Z',
    keycode: 122
  },
  {
    name: 'Kick',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/RP4_KICK_1.mp3',
    letter: 'X',
    keycode: 120
  },
  {
    name: 'Closed-HH',
    location: 'https://s3.amazonaws.com/freecodecamp/drums/Brk_Snr.mp3',
    letter: 'C',
    keycode: 99
  },
];

class App extends React.Component {
  constructor(props){
    super(props);
    this.state = {
      switchOff: false,
      currentLetter: '',
      keyCode: undefined
    };  
    this.handleSound = this.handleSound.bind(this);
    this.handleKeyPress = this.handleKeyPress.bind(this);
    this.playSound = this.playSound.bind(this);
    this.switchOff = this.switchOff.bind(this);
  }
  
  componentDidMount(){
    window.addEventListener('keypress', this.handleKeyPress);
  }
  
  handleKeyPress = async (event) => {
    let keyCode = event.keyCode;
    await this.setState({ keyCode: keyCode });
    this.playSound();
  }
  
  handleSound = async (e) => {
    // Set current letter in state to match the button pressed
    const currentLetter = e.target.id;
    // Set currentLetter in state
    await this.setState({ currentLetter: currentLetter }); 
    this.playSound();
  }
  
  playSound() {
    // Loop over sounds array, finding matching sound object and play associated sound 
    if(this.state.switchOff === false) {
      sounds.forEach((sound) => {
        if(sound.letter === this.state.currentLetter || sound.keycode === this.state.keyCode){
        let drumSound = new Audio(sound.location); 
        document.getElementById(sound.letter).classList.add('playing');
        setTimeout(() => {
          document.getElementById(sound.letter).classList.remove('playing');
        }, 200);
        drumSound.play(); 
        document.querySelector('.displayScreen').innerHTML=`${sound.name}`;
      }
    });   
   }
  }

switchOff() {
  this.setState({ switchOff: !this.state.switchOff });
  
  if(this.state.switchOff === false){
    console.log('its off');
    document.querySelector('.displayScreen').classList.remove('displayScreenOn');
    document.querySelector('.displayScreen').classList.add('displayScreenOff');
    document.getElementById('drum-machineOff').classList.add('drum-machineOff');
    document.querySelector('.displayScreen').innerHTML='';
  } else {
    document.querySelector('.displayScreen').classList.add('displayScreenOn');
    document.querySelector('.displayScreen').classList.remove('displayScreenOff');
    document.getElementById('drum-machineOff').classList.remove('drum-machineOff');
  }
}
    
  render() {
    return (
      <div>
        <div id="drum-machineOff"></div>
        <div id="drum-machine">
          <div id="drum-keys">
            {sounds.map((sound) => (
            // <audio src={sound.location} className="clip" id={sound.letter}></audio> was within button
              <button 
               onClick={this.handleSound} 
               id={sound.letter}
               className="drum-pad"
             >
             {sound.letter}
            </button>
            ))}
          </div>
          <div id="display">
            <div class="displayScreen displayScreenOn"></div>
            <div id="onButton">
              <span>On</span>
              <label class="switch">  
                <input type="checkbox" onClick={this.switchOff}></input>
              <span class="slider"></span>
              </label>
            Off</div>
            <h1>Drum Machine</h1>
          </div>
        </div>
      </div>
    );
  }
}

ReactDOM.render(<App/>, document.getElementById("root"));
              
            
!
999px

Console