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HTML 

              
                <div class="colorButtons">
    <button class="mode1"></button>
    <button class="mode2"></button>
    <button class="mode3"></button>
    <button class="mode4"></button>
  </div>

  <div class="container">
    <div class="casio-pt1">
      <div class="casio-left">
        <div class="speaker-container">
          <div class="speaker"></div>
        </div>
        <div class="speaker-bottom">
          <div class="power">
            <div class="led on"></div>
            <span>power</span>
          </div>
          <div class="logo">
            <span class="brand">CASIO</span>
            <div class="model">PT-1</div>
          </div>
        </div>
      </div>
      <div class="casio-right">
        <div class="casio-controls">
          <div class="controls-label">
            <div class="group">
              <div class="box">mode</div>
              <div class="options">
                <span class="fill inline">power off</span>
                <span>record</span>
                <span>play</span>
              </div>
            </div>
            <div class="group">
              <div class="box">volume</div>
              <div class="options">
                <span>min</span>
                <span class="volume">||||||||||</span>
                <span>max</span>
              </div>
            </div>

            <div class="group">
              <div class="box">tone</div>
              <div class="options">
                <span>piano</span>
                <span>fantasy</span>
                <span>violin</span>
                <span>flute</span>
              </div>
            </div>

            <div class="buttons group">
              <div class="options">
                <span>clear</span>
                <span>del.</span>
                <span class="arrow fill">▼</span>
                <span class="arrow fill">▲</span>
                <span>rhythm select</span>
                <span>reset</span>
                <span>demo</span>
                <span>memory play</span>
              </div>
              <div class="semi box">tempo</div>
            </div>

            <div class="group">
              <div class="last box">one key play</div>
            </div>
          </div>
          <div class="controls-buttons">
            <div class="grid">
              <div class="mode slider">
                <input id="off" type="radio" name="mode" value="off">
                <label for="off"></label>

                <input id="record" type="radio" name="mode" value="record">
                <label for="record"></label>

                <input id="play" type="radio" name="mode" value="play" checked>
                <label for="play"></label>
              </div>
              <div class="volume slider">
                <input id="v0" type="radio" name="volume" value="0">
                <label for="v0"></label>

                <input id="v1" type="radio" name="volume" value="0.25">
                <label for="v1"></label>

                <input id="v2" type="radio" name="volume" value="0.5">
                <label for="v2"></label>

                <input id="v3" type="radio" name="volume" value="0.75">
                <label for="v3"></label>

                <input id="v4" type="radio" name="volume" value="1" checked>
                <label for="v4"></label>
              </div>
              <div class="tone slider">
                <input id="piano" type="radio" name="tone" value="piano" checked>
                <label for="piano"></label>

                <input id="fantasy" type="radio" name="tone" value="fantasy">
                <label for="fantasy"></label>

                <input id="violin" type="radio" name="tone" value="violin">
                <label for="violin"></label>

                <input id="flute" type="radio" name="tone" value="flute">
                <label for="flute"></label>
              </div>
              <div class="buttons group">
                <div class="button steelblue" data-type="clear"></div>
                <div class="button orange" data-type="del"></div>
                <div class="button orange" data-type="down"></div>
                <div class="button orange" data-type="up"></div>
                <div class="button orange" data-type="rhythm"></div>
                <div class="button gold" data-type="reset"></div>
                <div class="button green" data-type="demo"></div>
                <div class="button grey" data-type="memory"></div>
              </div>
              <div class="end group">
                <div class="big button steelblue"></div>
                <div class="big button steelblue"></div>
              </div>
            </div>
          </div>
        </div>
        <div class="keys-container">
          <div class="name-keys">
            <div class="key-name"></div>
            <div class="key-name"></div>
            <div class="key-name" data-rhytm="march"></div>
            <div class="key-name" data-rhytm="waltz"></div>
            <div class="key-name" data-rhytm="4beat"></div>
            <div class="key-name" data-rhytm="swing"></div>
            <div class="key-name" data-rhytm="rock1"></div>
            <div class="key-name" data-rhytm="rock2"></div>
            <div class="key-name" data-rhytm="bossa nova"></div>
            <div class="key-name" data-rhytm="samba"></div>
            <div class="key-name" data-rhytm="rhumba"></div>
            <div class="key-name" data-rhytm="beguine"></div>
            <div class="key-name"></div>
            <div class="key-name"></div>
            <div class="key-name"></div>
            <div class="key-name"></div>
            <div class="key-name"></div>
            <div class="instrument-type">ELECTRONIC MUSICAL INSTRUMENT</div>
          </div>
          <div class="keys">
            <div class="black-keys">
              <div class="black key" data-note="G#3"></div>
              <div class="black key" data-note="A#3"></div>
              <div class="black key" data-note="C#4"></div>
              <div class="black key" data-note="D#4"></div>
              <div class="black key" data-note="F#4"></div>
              <div class="black key" data-note="G#4"></div>
              <div class="black key" data-note="A#4"></div>
              <div class="black key" data-note="C#5"></div>
              <div class="black key" data-note="D#5"></div>
              <div class="black key" data-note="F#5"></div>
              <div class="black key" data-note="G#5"></div>
              <div class="black key" data-note="A#5"></div>
            </div>
            <div class="white-keys">
              <div class="white key" data-note="G3"></div>
              <div class="white key" data-note="A3"></div>
              <div class="white key" data-note="B3"></div>
              <div class="white key" data-note="C4"></div>
              <div class="white key" data-note="D4"></div>
              <div class="white key" data-note="E4"></div>
              <div class="white key" data-note="F4"></div>
              <div class="white key" data-note="G4"></div>
              <div class="white key" data-note="A4"></div>
              <div class="white key" data-note="B4"></div>
              <div class="white key" data-note="C5"></div>
              <div class="white key" data-note="D5"></div>
              <div class="white key" data-note="E5"></div>
              <div class="white key" data-note="F5"></div>
              <div class="white key" data-note="G5"></div>
              <div class="white key" data-note="A5"></div>
              <div class="white key" data-note="B5"></div>
            </div>
          </div>
          <div class="note-keys">
            <div class="note">G</div>
            <div class="note">A</div>
            <div class="note">B</div>
            <div class="note">C</div>
            <div class="note">D</div>
            <div class="note">E</div>
            <div class="note">F</div>
            <div class="note">G</div>
            <div class="note">A</div>
            <div class="note">B</div>
            <div class="note">C</div>
            <div class="note">D</div>
            <div class="note">E</div>
            <div class="note">F</div>
            <div class="note">G</div>
            <div class="note">A</div>
            <div class="note">B</div>
          </div>
        </div>
      </div>
    </div>
  </div>

<div class="created">
  <span>Created by</span>
  <a href="https://manz.dev/"><h2>Manz.dev</h2></a>
  <p>on <a href="https://twitch.tv/ManzDev">Twitch</a> / <a href="https://youtube.com/c/ManzDev/videos">Youtube</a></p>
</div>
!

CSS 

              
                @use postcss-nested;

@font-face {
  font-family: Michroma;
  src:
    url(https://manzdev.github.io/twitch-casio-pt1/michroma.woff2) format("woff2"),
    url(https://manzdev.github.io/twitch-casio-pt1/michroma.woff) format("woff");
  font-display: swap;
}

@font-face {
  font-family: Tourney;
  src:
    url(https://manzdev.github.io/twitch-casio-pt1/tourney.woff2) format("woff2"),
    url(https://manzdev.github.io/twitch-casio-pt1/tourney.woff) format("woff");
  font-display: swap;
}

@font-face {
  font-family: Raleway;
  src:
    url(/raleway.woff2) format("woff2"),
    url(/raleway.woff) format("woff");
  font-display: swap;
}

:root {
  --casio-bgcolor: #171e27;
  --casio-color: #909eb4;
}

.colorButtons {
  display: flex;
  justify-content: center;
  padding: 0 10px;

  & button {
    width: 25px;
    height: 25px;
    margin: 0 5px;
    border-radius: 5px;
    border: 2px solid var(--casio-color);
    background: var(--casio-bgcolor);
  }
}

body {
  transition: background 1s;
}

body.dark {
  background: #000;
  animation: prepareSong 8s ease 8s alternate 3;
}

.thanos {
  width: 100px;
  animation: moveThanos 5s linear infinite;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 25;
  border-radius: 50%;
}

@keyframes moveThanos {
  0%,
  100% { transform: translate(0, 0); }
  25% { transform: translate(90vw, 75vh); }
  50% { transform: translate(90vw, 0); }
  75% { transform: translate(0, 75vh); }
}

@keyframes prepareSong {
  0% { background: #000; }
  100% { background: #333; }
}

body.party {
  background: var(--body-color, #000);
}

.container {
  display: flex;
  justify-content: center;
  margin-top: 3em;
}

.casio-pt1 {
  display: flex;
  width: 900px;
  height: 250px;
  background: var(--casio-bgcolor);
  border-radius: 4px;
  font-family: Raleway, Arial, serif;
  font-weight: 400;
  font-size: 9px;
  color: var(--casio-color);
  padding: 8px 5px 5px 5px;
  box-shadow:
    0 2px 1px #fffc inset,
    1px 1px 0 #0001,
    1px 1px 0 var(--casio-bgcolor),
    2px 2px 0 #0003,
    2px 2px 0 var(--casio-bgcolor),
    4px 4px 0 #0005,
    4px 4px 0 var(--casio-bgcolor),
    6px 6px 0 #0006,
    6px 6px 0 var(--casio-bgcolor),
    8px 8px 0 #0007,
    8px 8px 0 var(--casio-bgcolor),
    8px 8px 4px #0005;

  & .casio-left {
    width: 200px;
    min-width: 200px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;

    & .speaker-container {
      display: flex;
      justify-content: center;
      align-items: center;
      width: 100%;
      height: 100%;

      & .speaker {
        width: 170px;
        height: 180px;
        background:
          repeating-linear-gradient(to bottom, #0003 0 2px, #0005 2px 3px, transparent 3px 7px),
          linear-gradient(
            to right,
            transparent 0 32%,
            var(--casio-bgcolor) 32% 35%,
            transparent 35% 66%,
            var(--casio-bgcolor) 66% 68%,
            transparent 68% 100%
          ),
          radial-gradient(circle, #0001 65%, transparent 65% 100%);
      }
    }

    & .speaker-bottom {
      width: 100%;
      height: 50px;
      display: flex;

      & .power {
        width: 60px;
        height: 90%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;

        & .led {
          width: 12px;
          height: 4px;
          background: #2f1f2a;

          &.on {
            background: #c01812;
          }
        }
      }

      & .logo {
        display: flex;
        width: 100%;
        align-items: baseline;

        & .brand {
          font-family: "Michroma", sans-serif;
          font-weight: bold;
          font-size: 16px;
          margin-left: 6px;
        }

        & .model {
          font-family: "Tourney", serif;
          font-weight: normal;
          font-size: 18px;
          margin-left: 6px;
        }
      }
    }
  }

  & .casio-right {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    padding-right: 8px;

    & .casio-controls {
      min-height: 80px;
      border-top: 2px solid var(--casio-color);

      & .controls-label {
        display: flex;
        align-items: flex-end;
        font-size: 9px;

        & .group {
          display: inline-flex;
          flex-direction: column;
          align-items: center;

          &.buttons {
            & .semi.box {
              border-bottom: 0;
              border-radius: 2px 2px 0 0;
              padding: 2px 3px;
              position: absolute;
              height: 10px;
              transform: translate(-28px, -2px);
            }

            & .options {
              display: flex;
              align-items: flex-end;
            }

            & span:not(.fill)::after {
              content: "▪";
              display: block;
            }

            & .fill {
              margin: 0 2px;
              display: flex;
              justify-content: center;
              width: 5px;
              text-align: center;
            }

            & .arrow {
              width: 4px;
              margin: 0 6px;
            }
          }

          & .box {
            display: inline-block;
            border: 1px solid var(--casio-color);
            border-radius: 2px;
            padding: 0 10px;
            font-size: 10px;
            margin: 4px;

            &.last {
              margin-left: 2em;
            }
          }

          & .fill {
            background: var(--casio-color);
            color: var(--casio-bgcolor);
          }

          & .options {
            display: flex;

            & > span {
              display: inline-block;
              max-width: 26px;
              padding: 2px 5px;
              text-align: center;

              &.inline {
                max-width: none;
                width: 42px;
              }
            }

            & .volume {
              clip-path: polygon(0 50%, 100% 15%, 100% 85%, 0 50%);
            }
          }
        }

        & > :nth-child(4) .options {
          margin-left: 6px;

          & > span { width: 20px; }

          & > span:nth-child(n+7) {
            transform: translateX(-3px);
          }
        }
      }

      & .controls-buttons {
        width: 100%;
        height: 25px;
        margin: 4px 0;

        & .grid {
          border: 1px solid #0004;
          border-bottom-color: #fff4;
          border-right-color: #fff4;
          width: 100%;
          height: 100%;
          background:
            linear-gradient(to bottom, var(--casio-bgcolor) 0 15%, transparent 15% 85%, var(--casio-bgcolor) 85% 100%),
            repeating-linear-gradient(to right, transparent 0 2px, #0004 2px 3px);
          display: flex;
          align-items: center;

          & > div {
            background: var(--casio-bgcolor);
            padding: 0 6px;

            &:nth-child(1) { margin-left: 32px; }
            &:nth-child(2) { margin-left: 36px; }
            &:nth-child(3) { margin-left: 38px; }
            &:nth-child(4) { margin-left: 36px; }
            &:nth-child(5) { margin-left: 38px; }
          }

          & .group {
            display: flex;
            justify-content: space-around;

            &.buttons .button {
              margin: 0 10px;
            }

            &.end {
              margin-left: 24px;

              & .big {
                margin: 0 4px;
              }
            }
          }

          & .button {
            display: inline-block;
            border: 0;
            width: 8px;
            height: 18px;
            background: black;
            box-shadow:
              1px 1px 2px #0006,
              1px 0 0 #fff5 inset;

            &:active {
              box-shadow: 0 0 3px #0005 inset;
            }
          }

          & .big.button {
            width: 26px;
            background-image:
              linear-gradient(to top, #44517a 0 20%, transparent 20% 80%, #44517a 80% 100%),
              repeating-linear-gradient(to top, transparent 0 1px, #0003 1px 2px);
          }

          & .steelblue { background: #44517a; }
          & .orange { background: #b34431; }
          & .gold { background: #b67523; }
          & .green { background: #398d79; }
          & .grey { background: #53586b; }

          & .slider {
            display: flex;
            align-items: center;
            height: 18px;
            border: 1px solid #0004;
            border-bottom-color: #fff7;
            border-right-color: #fff7;
            box-shadow: 2px 2px 2px #0003 inset;

            & input {
              display: none;
            }

            & input + label {
              display: block;
              width: 12px;
              height: 8px;
              background: #000;
            }

            & input:checked + label {
              height: 16px;
              background: transparent;
              display: flex;
              position: relative;

              &::before,
              &::after {
                content: "";
                display: block;
                background: #444;
                width: 5px;
                border-radius: 1px;
                border-right: 1px solid #222;
                height: 16px;
                position: absolute;
              }
              &::after { right: 0; }
            }
          }
        }
      }
    }

    & .keys-container {
      display: flex;
      flex-direction: column;
      height: 100%;
      border-top: 4px solid var(--casio-color);
      position: relative;

      & .name-keys {
        min-height: 15px;
        display: flex;

        & .key-name {
          width: 100%;
          text-align: center;
          position: relative;

          &[data-rhytm]::before {
            content: attr(data-rhytm);
          }

          &:nth-child(9) {
            &::before {
              width: 200%;
              position: absolute;
              left: -50%;
            }

            &::after {
              margin-top: 10px;
            }
          }

          &[data-rhytm]::after {
            content: "|";
            display: block;
          }
        }

        & .instrument-type {
          font-size: 8px;
          position: absolute;
          right: 0;
        }
      }

      & .keys {
        min-height: 135px;
        position: relative;
        box-shadow: 0 1px 0 1px #1113;

        & .black-keys {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 73px;
          display: flex;
          justify-content: space-evenly;

          & .black.key {
            grid-area: key;
            width: 22px;
            height: 100%;
            background-color: #111;
            background-image:
              linear-gradient(to right, #111 0 2px, transparent 2px),
              linear-gradient(to left, #111 0 2px, transparent 2px),
              linear-gradient(to top, transparent 0 3px, #fff8 4px 5px, transparent 8px);
            border: 1px outset #ccc;
            border-top: 0;
            border-bottom-left-radius: 4px;
            border-bottom-right-radius: 4px;
            position: relative;
            z-index: 10;

            &:nth-child(2),
            &:nth-child(4),
            &:nth-child(7),
            &:nth-child(9) {
              margin-right: 28px;
            }

            &:active,
            &.active {
              z-index: 8;
              background-image:
                linear-gradient(to right, #111 0 2px, transparent 2px),
                linear-gradient(to left, #111 0 2px, transparent 2px),
                linear-gradient(to top, transparent 0 1px, #fff3 2px 3px, transparent 6px);
            }
          }
        }

        & .white-keys {
          display: flex;
          height: 100%;

          & .white.key {
            width: 100%;
            height: 136px;
            background: #fff;
            border: 1px solid #ccc;
            border-left: 2px solid #fff;
            border-right: 2px solid #ddd;
            border-top: 0;
            border-bottom-left-radius: 4px;
            border-bottom-right-radius: 4px;
            position: relative;
            z-index: 5;
            box-shadow: 0 2px 2px #0004;

            &::after {
              content: "";
              display: block;
              background: linear-gradient(to bottom, #0006 0 1px, #0005 2px 10px, transparent 15% 100%);
              width: 100%;
              height: 100%;
              position: absolute;
              top: 0;
            }

            &:active,
            &.active {
              transform: translate(2px, 0);
              z-index: 2;
              border-top: 2px solid #fff;
              box-shadow: 0 0 2px #0004;

              &::after {
                transform: translate(-2px, -2px);
              }
            }
          }
        }
      }

      & .note-keys {
        width: 100%;
        height: 100%;
        display: flex;
        font-size: 8px;
        justify-content: space-around;
        transform: translateY(3px);
        box-shadow: 0 5px 4px #0005 inset;
        border-right: 1px solid #fff2;
        border-top: 1px solid #0007;
        position: relative;
        top: -2px;
        left: -1px;
        padding: 0 1px;
      }
    }
  }
}

.created {
  background: 
    url(https://assets.codepen.io/154065/internal/avatars/users/default.png),
    linear-gradient(to bottom, #884ced, #ec1cce);
  background-size: 75px 75px, cover;
  background-repeat: no-repeat;
  position: absolute;
  top: 0;
  right: 0;
  width: 250px;
  height: 75px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-left: 2em;
  
  & span,
  & h2,
  & p,
  & a {
    font-family: Montserrat;
    margin: 0;
  }
  
  & a,
  & p,
  & span {
    color: #fff;    
  }
  
  & h2 {
    font-weight: 700;
    transform: translate(0, -4px);    
  }
  
  & a {
    text-decoration-color: rgba(255,255,255,0.4);
  }
  
  & a:hover {
    color: #e6e82a;
  }
}
!

JS 

              
                import Soundfont from "https://cdn.skypack.dev/soundfont-player";

const NOTES = {
  "keyz": "G3",
  "keyx": "A3",
  "keyc": "B3",
  "keyv": "C4",
  "keyb": "D4",
  "keyn": "E4",
  "keym": "F4",
  "keyq": "G4",
  "keyw": "A4",
  "keye": "B4",
  "keyr": "C5",
  "keyt": "D5",
  "keyy": "E5",
  "keyu": "F5",
  "keyi": "G5",
  "keyo": "A5",
  "keyp": "B5",
  "keys": "G#3",
  "keyd": "A#3",
  "keyg": "C#4",
  "keyh": "D#4",
  "keyk": "F#4",
  "keyl": "G#4",
  "keyñ": "A#4",
  "key5": "C#5",
  "key6": "D#5",
  "key8": "F#5",
  "key9": "G#5",
  "key0": "A#5"
};

const ac = new AudioContext();
const options = { soundfont: "FluidR3_GM" };
const cumbiaSong = new Audio("https://manzdev.github.io/twitch-casio-pt1/cumbia.mp3");
cumbiaSong.volume = 0.45;
const playingNotes = {};
let currentInstrument = "piano";
let currentVolume = 1;
let thanosMode = false;

const COLORMODES = [
  { bgcolor: "#171e27", color: "#909eb4" },
  { bgcolor: "#c0beaf", color: "#4d1210" },
  { bgcolor: "#c02628", color: "#e17d75" },
  { bgcolor: "#becedd", color: "#6b799e" },
];

const colorsButtons = document.querySelectorAll(".colorButtons button");
colorsButtons.forEach((button, index) => {
  button.style.setProperty("--casio-bgcolor", COLORMODES[index].bgcolor);
  button.style.setProperty("--casio-color", COLORMODES[index].color);
  button.addEventListener("click", () => {
    document.body.style.setProperty("--casio-bgcolor", COLORMODES[index].bgcolor);
    document.body.style.setProperty("--casio-color", COLORMODES[index].color);
  });
});

const instruments = {
  piano: "acoustic_grand_piano",
  fantasy: "lead_2_sawtooth",
  violin: "violin",
  flute: "flute"
};

for (const pair of Object.entries(instruments)) {
  const [key, value] = pair;
  Soundfont.instrument(ac, value, options)
    .then(data => { instruments[key] = data; });
}

const play = (instrument, note, duration = 6) => {
  playingNotes[note] = instruments[instrument].start(note, ac.currentTime, { duration, gain: currentVolume });
};

const stop = (note) => {
  const playingNote = playingNotes[note];
  playingNote.stop();
  playingNotes[note] = null;
};

const pianoKeys = document.querySelectorAll(".key");
pianoKeys.forEach(key => {
  const note = key.dataset.note;
  key.addEventListener("mousedown", () => play(currentInstrument, note));
  key.addEventListener("mouseleave", () => playingNotes[note] && stop(note));
  key.addEventListener("mouseup", () => playingNotes[note] && stop(note));
});

document.addEventListener("keydown", (ev) => {
  const id = `key${ev.key}`;
  const note = NOTES[id];
  if (!playingNotes[note] && note) {
    const key = document.querySelector(`[data-note="${note}"]`);
    key.classList.add("active");
    play(currentInstrument, note);
  }
});

document.addEventListener("keyup", (ev) => {
  const id = `key${ev.key}`;
  const note = NOTES[id];
  if (playingNotes[note] && note) {
    const key = document.querySelector(`[data-note="${note}"]`);
    key.classList.remove("active");
    stop(note);
  }
});

const toneSliders = document.querySelectorAll(".tone input");
toneSliders.forEach(input => {
  input.addEventListener("click", () => {
    const instrument = input.id;
    currentInstrument = String(instrument);
  });
});

const volumeSliders = document.querySelectorAll(".volume input");
volumeSliders.forEach(input => {
  input.addEventListener("click", () => {
    const volume = input.value;
    currentVolume = Number(volume);
  });
});

// Thanos egg easter
const COLORS = ["#d81313", "#eace17", "#33ea12", "#12eae3", "#101eea", "#ea10e3"];

const changeColor = () => {
  setTimeout(() => {
    const color = COLORS[~~(Math.random() * COLORS.length)];
    document.body.classList.remove("dark");
    document.body.style.setProperty("--body-color", color);
    if (thanosMode) { setTimeout(() => changeColor(), 350); }
  }, 350);
};

const disableThanosMode = () => {
  document.body.classList.remove(...["dark", "party"]);
  const thanosImage = document.querySelector(".thanos");
  thanosImage && thanosImage.remove();
  thanosMode = false;
  cumbiaSong.pause();
};

const enableThanosMode = () => {
  thanosMode = true;
  cumbiaSong.currentTime = 0;
  cumbiaSong.play();
  document.body.classList.add("dark");

  // Thanos image add
  setTimeout(() => {
    const image = document.createElement("img");
    image.src = "https://manzdev.github.io/twitch-casio-pt1/thanos.png";
    image.className = "thanos";
    document.body.appendChild(image);
  }, 18000);

  // Party mode
  setTimeout(() => {
    document.body.classList.add("party");
    changeColor();
  }, 27000);
};

const demoButton = document.querySelector("[data-type=demo");
demoButton.addEventListener("click", () => {
  if (cumbiaSong.paused) { enableThanosMode(); } else { disableThanosMode(); }
});
!
999px

Console