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HTML

              
                #drum-machine
img#pic(src="https://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Drum_Kit_3.svg/2000px-Drum_Kit_3.svg.png" alt="DRUM MACHINE!")
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Heebo|Orbitron|Righteous');

// $stripe1: #0FFF95;
// $stripe2: #06BA63;
// $border1: #103900;
$stripe1: #D4AA7D;
$stripe2: #EFD09E;
$stripe3: #665843;
$stripe4: #565133;
$border1: #66513C;
$border2: #3F3225;
$light: #E2D686;

body {
  font-family: "Heebo", cursive, sans-serif;
  background: #FFEEEE;
  background: -webkit-linear-gradient(to right, #DDEFBB, #FFEEEE); 
  background: linear-gradient(to right, #DDEFBB, #FFEEEE);
  display: flex;
  justify-content: center;
  align-items: center;
  @media (max-width: 665px) {
    display: block;
  }
}

button:hover {
  cursor: pointer;
}

input {
  width: 40px;
}

#display {
  border: 15px ridge $border2;
  border-radius: 10px;
  display: block;
    background: repeating-linear-gradient(
    45deg,
    $stripe3,
    $stripe3 5px,
    $stripe4 5px,
    $stripe4 10px
  );
}

.flexCenter {
  display: flex;
  justify-content: center;
}

.controls {
  @extend .flexCenter;
  align-items: "center";
  width: 100%;
  flex-wrap: wrap;
  & label {
    margin-top: 20px;
  }
}

.bpmInput {
  height: 20px;
  margin-top: 15px;
  background: rgba(255,249,196,1);
  font-family: 'Orbitron', sans-serif;
  border: 5px $border1 inset;
}

.controlBtn {
  margin: 10px;
  -moz-box-shadow:inset 0px 1px 0px 0px #a6827e;
	-webkit-box-shadow:inset 0px 1px 0px 0px #a6827e;
	box-shadow:inset 0px 1px 0px 0px #a6827e;
	background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #d9be36), color-stop(1, #c29232));
	background:-moz-linear-gradient(top, #d9be36 5%, #c29232 100%);
	background:-webkit-linear-gradient(top, #d9be36 5%, #c29232 100%);
	background:-o-linear-gradient(top, #d9be36 5%, #c29232 100%);
	background:-ms-linear-gradient(top, #d9be36 5%, #c29232 100%);
	background:linear-gradient(to bottom, #d9be36 5%, #c29232 100%);
	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#d9be36', endColorstr='#c29232',GradientType=0);
	background-color:#d9be36;
	-moz-border-radius:3px;
	-webkit-border-radius:3px;
	border-radius:3px;
	border:1px solid #54381e;
	display:inline-block;
	cursor:pointer;
	color:#ffffff;
	font-family: 'Orbitron', sans-serif;
	font-size:13px;
	padding:6px 24px;
	text-decoration:none;
	text-shadow:0px 1px 0px #4d3534;
  &:hover {
    background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #c29232), color-stop(1, #d9be36));
    background:-moz-linear-gradient(top, #c29232 5%, #d9be36 100%);
    background:-webkit-linear-gradient(top, #c29232 5%, #d9be36 100%);
    background:-o-linear-gradient(top, #c29232 5%, #d9be36 100%);
    background:-ms-linear-gradient(top, #c29232 5%, #d9be36 100%);
    background:linear-gradient(to bottom, #c29232 5%, #d9be36 100%);
    filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#c29232', endColorstr='#d9be36',GradientType=0);
    background-color:#c29232;
  }
  &:active {
    position:relative;
	  top:1px;
  }
}

.drumMachineContainer {
  display: block;
  width: 530px;
  margin: 10px;
  padding: 15px;
  background: repeating-linear-gradient(
    45deg,
    $stripe2,
    $stripe2 10px,
    $stripe1 10px,
    $stripe1 20px
  );
  @media (max-width: 635px) {
    overflow-x: scroll;
  } 
  border-radius: 5px;
  border: 10px $border1 inset;
}

.drumPads {
  display: flex;
  flex-wrap: wrap;
  width: 80px;
}

.drum-pad {
  width: 80px;
  margin: 10px;
  -moz-box-shadow:inset 0px 1px 0px 0px #a6827e;
	-webkit-box-shadow:inset 0px 1px 0px 0px #a6827e;
	box-shadow:inset 0px 1px 0px 0px #a6827e;
	background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #c78e56), color-stop(1, #613b13));
	background:-moz-linear-gradient(top, #c78e56 5%, #613b13 100%);
	background:-webkit-linear-gradient(top, #c78e56 5%, #613b13 100%);
	background:-o-linear-gradient(top, #c78e56 5%, #613b13 100%);
	background:-ms-linear-gradient(top, #c78e56 5%, #613b13 100%);
	background:linear-gradient(to bottom, #c78e56 5%, #613b13 100%);
	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#c78e56', endColorstr='#613b13',GradientType=0);
	background-color:#c78e56;
	-moz-border-radius:3px;
	-webkit-border-radius:3px;
	border-radius:3px;
	border:1px solid #54381e;
	display:inline-block;
	cursor:pointer;
	color:#ffffff;
	font-family:Arial;
	font-size:13px;
	padding:6px 24px;
	text-decoration:none;
	text-shadow:0px 1px 0px #4d3534;
  &:hover {
    background:-webkit-gradient(linear, left top, left bottom, color-stop(0.05, #613b13), color-stop(1, #c78e56));
    background:-moz-linear-gradient(top, #613b13 5%, #c78e56 100%);
    background:-webkit-linear-gradient(top, #613b13 5%, #c78e56 100%);
    background:-o-linear-gradient(top, #613b13 5%, #c78e56 100%);
    background:-ms-linear-gradient(top, #613b13 5%, #c78e56 100%);
    background:linear-gradient(to bottom, #613b13 5%, #c78e56 100%);
    filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#613b13', endColorstr='#c78e56',GradientType=0);
    background-color:#613b13;
  }
  &:active {
    @extend .btnActive;
  }
}

.btnActive {
  position:relative;
  color: gold;
  top:1px;
}

.drumName {
  @extend .flexCenter;
  width: 100px;
  align-items: center;
}

.noteRow {
  display: flex;
  flex-wrap: no-wrap;
}

.completeRow {
  display: flex;
}

.toggleButton {
  width: 20px;
  border: 3px ridge #555555;
}

.light {
  background: black;
  border: 3px ridge #555555;
  border-radius: 50%;
  width: 14px;
  height: 10px;
}

#pic {
  position: fixed;
  width: 200px;
  height: 200px;
  z-index: -1;
  top: calc(50vh - 100px);
  left: calc(50vw - 100px);
}
              
            
!

JS

              
                const _keyChars = "Q, W, E, A, S, D, Z, X, C".match(/[A-Z]/g);
const url = "https://s3.eu-west-2.amazonaws.com/drumkit-fcc/";
const audioFiles = "crash ride tomHigh tomLow openHat closedHat clap snare kick".split(" ");
const originalState = {};
const aud = {};

// Howler Audio & Create Original State

for (const _key of _keyChars) {
  originalState[_key] = "0".repeat(16);
  const keyIndex = _keyChars.indexOf(_key);
  aud[_key] = new Howl({
    src: url+audioFiles[keyIndex]+".mp3"
  });
}

// Redux

const noteReducer = (state = originalState, action) => {
  if (_keyChars.indexOf(action.type) > -1 && action.type !== "reset") {
    let newObj = Object.assign(state);
    let spl = newObj[action.type].split("");
    spl[action.timing] = spl[action.timing] === "0" ? "1" : "0";
    let newRow = spl.join("");
    newObj[action.type] = newRow;
    return newObj;
  } else if (action.type === "reset") {
    let blankSlate = {};
    for (const _key of _keyChars) {
      blankSlate[_key] = "0".repeat(16);
    }
    return blankSlate;         
  } else if (action.type === "demo") {
    const demoComposition = {
      A: "0000000000001000",
      C: "1000000010000000",
      D: "0111011101110101",
      E: "0000100000000000",
      Q: "0000000010000000",
      S: "0000000000000010",
      W: "1000000000000000",
      X: "0000100000001000",
      Z: "0000000000000010"
    }
    return demoComposition;
  } else {
    return state;
  }
}

const store = Redux.createStore(noteReducer);

const toggleNote = (_noteKey, _timing) => store.dispatch({
  type: _noteKey,
  timing: _timing
});

// React

class MyApp extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      playing: false,
      currentPosition: 0,
      bpm: 120
    }
    this.handleChange = this.handleChange.bind(this);
    this.playComposition = this.playComposition.bind(this);
    this.play = this.play.bind(this);
    this.stop = this.stop.bind(this);
    this.pause = this.pause.bind(this);
    this.reset = this.reset.bind(this);
  }
  handleChange(e) {
    let val = e.target.value;
    if (val > 0 && val < 1000) this.setState({bpm: val});
  }
  playComposition() {
    if (!this.state.playing) this.setState({playing: true}, () => this.play());
  }
  play() {
    let composition = store.getState(); // May not want to call this every note
    for (let i = 0; i < _keyChars.length; i++) {
      if (composition[_keyChars[i]][this.state.currentPosition] === "1") {
        aud[_keyChars[i]].play();
      }
    }
    if (this.state.playing) {
      let nextPosition = this.state.currentPosition === 15 ? 0 : this.state.currentPosition + 1;
      this.setState({ currentPosition: nextPosition });
      setTimeout(() => {
        if (this.state.playing) this.play();
      }, 15000 / this.state.bpm);
    }
  }
  pause() {
    for (let i = 0; i < _keyChars.length; i++) {
      aud[_keyChars[i]].stop();
    }
    this.setState({
      playing: false
    });
  }
  stop() {
    for (let i = 0; i < _keyChars.length; i++) {
      aud[_keyChars[i]].stop();
    }
    this.setState({
      playing: false,
      currentPosition: 0
    });
  }
  reset() {
    if (confirm("Are you sure you want to reset everything?")) {
      store.dispatch({type: "reset"});
      this.forceUpdate();
    }
  }
  render() {
    return (
      <div id="display">
        <div className="controls">
          <button className="controlBtn" onClick={this.playComposition}><i class="material-icons">play_arrow</i></button>
          <button className="controlBtn" onClick={this.stop}><i class="material-icons">stop</i></button>
          <button className="controlBtn" onClick={this.pause}><i class="material-icons">pause</i></button>
          <label>BPM:&nbsp; </label>
          <input className="bpmInput" type="number" value={this.state.bpm} onChange={this.handleChange}></input>
          <button className="controlBtn" onClick={this.reset}>Reset</button>
        </div>
        <div className="flexCenter">
          <div className="drumMachineContainer">
            <Drums playing={this.state.playing} position={this.state.currentPosition} keyChars={_keyChars} /> 
          </div>
        </div>
      </div>
    );
  }
}

class Drums extends React.Component {
  constructor(props) {
    super(props);
  }
  render() {
    const drumArr = [];
    const kc = this.props.keyChars;
    const drumNames = audioFiles.map(a => {
      if (/[A-Z]/.test(a)) {
        let arr = a.split("");
        let regMatch = a.match(/[A-Z]/);
        arr.splice(arr.indexOf(regMatch[0]), 0, " ");
        a = arr.join("");
      } 
      a = a.replace(a[0], a[0].toUpperCase());
      return a;
    });
    for (let i = 0; i < kc.length; i++) {
      drumArr.push(
        <div className="completeRow">
          <label id={"name-"+kc[i]} className="drumName">{drumNames[i]}</label>
          <button onClick={() => aud[kc[i].toString()].play()} className="drum-pad" id={"drum-"+kc[i]} key={"drum-"+kc[i]}>{kc[i]}</button>
          <NoteRow key={"row-"+kc[i]} note={kc[i]}/>
        </div>
      );
    }
    // Lights to show current position
    const posLights = <PositionLights playing={this.props.playing} position={this.props.position} />
    drumArr.unshift(posLights);
    drumArr.push(posLights);
    return(
      <div className="drumPads">{drumArr}</div>
    );
  }
}
  
class NoteRow extends React.Component {
  constructor(props) {
    super(props);
    this.rowButtons = this.rowButtons.bind(this);
    this.toggle = this.toggle.bind(this);
  }
  toggle(n, ind) {
    toggleNote(n, ind);
    aud[n].play();
    this.forceUpdate();
  }
  btnActive(active) {
    if (active) {
      return {
        backgroundColor: "#E2D686"
      }
    } else {
      return {
        backgroundColor: "#404444"
      }
    }
  }
  rowButtons() {
    let arr = [];
    for (let i = 0; i < 16; i++) {
      arr.push(
        <button 
          style={this.btnActive(store.getState()[this.props.note][i] === "1")} 
          className="toggleButton" 
          onClick={() => this.toggle(this.props.note, i)}>
        </button>
      );
    }
    return arr;
  }
  render() {
    return (
      <div className="noteRow">
        {this.rowButtons()}
      </div>
    );
  }
}

class PositionLights extends React.Component {
  constructor(props) {
    super(props);
    this.onOff = this.onOff.bind(this);
  }
  onOff(index) {
    if (this.props.playing && this.props.position === index) {
      return { backgroundColor: "#AFC97E"}; 
    } else {
      return { backgroundColor: "black"}; 
    }
  };
  render() {
    const gap = { width: 200 };
    const lights = [];
    for (let i = 0; i < 16; i++) {
      lights.push(<div key={"light-"+i} style={this.onOff(i)} className="light" />)
    }
    return (
      <div className="completeRow"><div style={gap}></div>{lights}</div>
    );
  }
}

ReactDOM.render(<MyApp />, document.getElementById("drum-machine"));

// Keypress Event Listeners

window.addEventListener("keypress", hitKey, false);

function hitKey(e) {
  //const codesForChars = [113, 119, 101, 97, 115, 100, 122, 120, 99];
  const codesForChars = _keyChars.map(k => k.toLowerCase().charCodeAt(0));
  if (codesForChars.indexOf(e.keyCode) > -1) {
    let userKey = String.fromCharCode(e.keyCode).toUpperCase();
    aud[userKey].play();
    let drum = document.getElementById('drum-'+userKey);
    let name = document.getElementById('name-'+userKey);
    drum.classList.add("btnActive");
    name.classList.add("btnActive");
    setTimeout(() => {
      drum.classList.remove("btnActive");
      name.classList.remove("btnActive");
    }, 200);
  }
}
              
            
!
999px

Console