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HTML

              
                <h1>Happy 30th Birthday, GameBoy!!</h1>
<p>⚡ Author: 
  <a href="https://twitter.com/Manz">Manz</a> / 
  <a href="https://github.com/ManzDev">ManzDev</a>
</p>

<div class="wrapper">
  <div class="power"></div>
  <div class="gameboy">
    <div class="top">
      <div class="corner left"></div>
      <div class="top">
        <span>◁ OFF·ON ▷</span>
      </div>
      <div class="corner right"></div>
    </div>
    <div class="screen">
      <div class="top">
        <span>DOT MATRIX WITH STEREO SOUND</span>
      </div>
      <div class="bottom">
        <div class="battery">
          <div class="led"></div>
          <span>BATTERY</span>
        </div>
        <div class="gamescreen">
          <span>Nintendo<sup>®</sup></span>
        </div>
      </div>
    </div>
    <div class="brand">
      <span>Nintendo</span>
      <span>GAME BOY</span>
      <sub>™</sub>
    </div>

    <div class="controls">
      <div class="cross">
        <div class="cursor up"></div>
        <div class="cursor left"></div>
        <div class="cursor center">
          <div class="circle"></div>
        </div>
        <div class="cursor right"></div>
        <div class="cursor down"></div>
      </div>
      <div class="buttons">
        <div class="button B" data-button="B"></div>
        <div class="button A" data-button="A"></div>
      </div>
    </div>

    <div class="speaker">
      <div class="band"></div>
      <div class="band"></div>
      <div class="band"></div>
      <div class="band"></div>
      <div class="band"></div>
      <div class="band"></div>
    </div>

    <div class="bottom">
      <div class="gamecontrols">
        <div class="gap"><div class="button select" data-button="SELECT"></div></div>
        <div class="gap"><div class="button start"  data-button="START"></div></div>
      </div>    
      <div class="phones">🎧PHONES</div>
    </div>

  </div>
</div>
              
            
!

CSS

              
                @use postcss-nested;
@import url('https://fonts.googleapis.com/css?family=Lato|Press+Start+2P');
@import url('http://db.onlinewebfonts.com/c/487390d5558cff7a17ce35d7d92a0540?family=Pretendo');

/* Layout */
body {
  background-color: #000;
  background-image: 
    repeating-linear-gradient(
      132deg, #000 0% 10%, transparent 10% 11%, #000 11% 21%, 
      transparent 21% 22%),
    linear-gradient(50deg, #7e2e52 30%, #513a8d 60%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;  
  height: 98vh;
}

h1 {
  font-family: 'Press Start 2P', sans-serif;
  margin-bottom: 2em;
  text-align: center;
  max-width: 800px;
  line-height: 130%;
  color: #8bac0f;
  text-shadow: 1px 1px 0 #fff;
  margin: 0;  
}

h1 + p {
  font-family: Lato, sans-serif;
  font-size: 16px;
  color: #fff;
  margin-bottom: 2em;
}
p a { color: #c78dff; }

.wrapper {
  --gameboy-width: 375px;
  --gameboy-height: 625px;

  width: var(--gameboy-width);
  height: var(--gameboy-height);
  position: relative;
}

/* GameBoy console body */
.gameboy {
  background: #d3ccd3 linear-gradient(#d3ccd3 95%, #999 98%, #777 99%);
  overflow: hidden;
  border-radius: 12px 12px 75px 12px;
  box-shadow: 0 0 10px rgba(0,0,0, 0.5), 0 0 15px rgba(0,0,0, 0.75) inset;
  
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  
  position: relative;
}

.power {
  width: 30px;
  height: 15px;
  border-radius: 50%;
  background: linear-gradient(to right, #eee 10%, #d3ccd3 30% 70%, #eee 90%);
  box-shadow: 0 0 4px rgba(0,0,0, 0.5) inset;
  position: absolute;
  top: -7px;
  left: 50px;
  cursor: pointer;
  
  &.on { left: 75px; }
}

.gameboy > .top {
  display: flex;
  padding-bottom: 5px;
  margin-bottom: 5px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  
  & .corner { 
    width: 25px;
    height: 20px;
  }
  & .corner.left { margin-right: 5px; }
  & .corner.right { margin-left: 5px; }
  & .top { 
    width: 100%;
  }
  
  & > div {
    border-radius: 0 0 2px 2px;
    border: 1px solid rgba(0,0,0, 0.1);
    box-shadow: 1px 1px 3px rgba(0,0,0, 0.25);
    
    & span {
      font-family: Arial, sans-serif;
      font-size: 12px;
      box-shadow: 2px 2px 2px rgba(0,0,0, 0.5) inset;
      text-shadow: 2px 1px 2px rgba(0,0,0, 1);     
      color: #eee;
      border-radius: 15px;
      margin: 0 6px;
      padding: 2px 5px;
      opacity: 0.25;
    }
  }
}

/* GameBoy complete screen (gray + green) */
.screen {
  background: #767189;
  width: calc(var(--gameboy-height) / 2);
  box-shadow: 0 0 2px #514c65;
  border-radius: 10px 10px 35px 10px;  
  height: 250px;
  margin: 0.1em auto;
  
  & span {
    font-family: Arial, sans-serif;
    font-size: 10px;
    color: #fff;    
  }
  
  & .top {
    margin: 0 15px;
    height: 30px;
    background: linear-gradient(
      transparent 10px, #7d1a4a 10px 12px, transparent 12px 16px, 
      #35224e 16px 18px, transparent 18px);
    position: relative;
    
    & span {
      padding: 0 8px;
      background: #767189;
      
      position: absolute;
      right: 30px;
      top: 8px;
    }
  }
  
  .bottom {
    display: flex;

    & .led {
      width: 10px;
      height: 10px;
      background: #4a4748;
      border-radius: 50%;
      margin: 6px;

      &.on {
        background: #d81e07;    
        box-shadow: 0 0 5px #d81e07;      
      }
    }

    & .battery {
      padding: 0 10px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
    }
  }  
}

/* Game Screen (only green screen) */
.gamescreen {
  background: #9ca04c;
  width: 200px;
  height: 190px;
  box-shadow: 5px 5px 10px rgba(0,0,0, 0.5) inset, -2px -2px 10px rgba(0,0,0, 0.25) inset;
  
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow: hidden;
  
  & span {    
    display: none;
    font-family: 'Press Start 2P';
    font-weight: bold;
    font-size: 18px;
    letter-spacing: -1px;
    color: #0f380f;
    
    & sup {
      font-weight: normal;
      font-size: 12px;
    }    
  }

  &.startup span {
    display: block;
    animation: startup 2s linear forwards;    
    transform: translate(0, -25px);
  }  
}

@keyframes startup {
  0% { transform: translate(0, -25px); }
  100% { transform: translate(0, 80px); }
}

/* Brand Nintendo GameBoy text */
.brand {
  margin: 5px 30px;
  
  & span {
    font-family: Pretendo, sans-serif;
    font-size: 15px;
    color: #302058;
  }
  
  & span:nth-child(2) {
    font-family: Lato, sans-serif;
    font-weight: bold;
    font-style: italic;
    font-size: 22px;
  }
}

/* Main controls: Cross and A/B buttons */
.controls {
  display: flex;
  justify-content: space-between;
}

.cross {
  background: linear-gradient(to bottom, #c4bfc6 -10%, #e2e0eb 130%);
  border-radius: 50%;
  padding: 10px;
  width: 100px;
  height: 100px;
  margin: 30px;
  display: grid;
  grid-template-areas: ". up ." "left center right" ". down .";
  
  & .cursor { 
    background: #040308;
    border: 3px solid #040308;
    box-shadow: 2px 4px 3px rgba(0,0,0, 0.6);
    display: flex;
  }
  
  & .cursor.up,
  & .cursor.left,
  & .cursor.right {
    border-top-color: #c5d8e1;    
  }
  
  & .cursor .circle {
    border: 1px solid #111;
    border-left: 0;
    border-bottom: 0;
    border-radius: 50%;
    width: 100%;
    height: 100%;
    background: conic-gradient(transparent 0 30%, rgba(255,255,255, 0.5) 40% 60%, transparent 70%);
  }
  
  & .cursor.up { grid-area: up; }
  & .cursor.left { grid-area: left; }
  & .cursor.center { grid-area: center; }
  & .cursor.right { grid-area: right; }
  & .cursor.down { grid-area: down; }
  
  & .cursor:active { 
    box-shadow: none;
    border-color: #111;
  }
  & .cursor.center:active { border-color: #040308; }
}

.buttons {
  background: linear-gradient(#b7acb1 -10%, #f1f3f2 130%);
  border-radius: 40px;
  padding: 5px;
  height: 60px;
  display: flex;
  align-items: center;
  margin: 50px 30px 0 0;
  transform: rotate(-30deg);

  & .button {
    width: 50px;
    height: 50px;
    box-shadow: -2px 3px 5px rgba(0,0,0, 1), -3px 4px 3px rgba(255, 255, 255, 0.25) inset;
    margin: 0 6px;
    border-radius: 50%;
    background: #6f001a;
    
    &:active {
      box-shadow: -3px 4px 3px rgba(0,0,0, 0.25) inset, 2px -2px 3px rgba(0,0,0, 0.25) inset;
    }
  }
  & .button::after {
    font-family: Pretendo, sans-serif;
    font-size: 16px;
    color: #302058;
    content: attr(data-button);
    position: relative;
    right: -15px;
    bottom: -65px;
  }
}

/* Secondary controls: Select & Start */
.gamecontrols {
  display: flex;
  justify-content: center;
  margin-bottom: 50px;
  
  & .gap {
    background: linear-gradient(#b7acb1 -10%, #f1f3f2 130%);
    transform: rotate(-28deg);
    margin: 0 5px;
    border-radius: 15px;
  }
    
  & .button {
    background: #9e9baf;
    border-radius: 10px;
    box-shadow: 
      -2px -2px 5px rgba(0,0,0, 0.4) inset, 
      2px 2px 5px rgba(255,255,255, 0.7) inset, 
      2px 2px 6px rgba(0,0,0, 0.8);
    width: 50px;
    height: 12px;
    margin: 6px 8px;
    
    &:active {
      box-shadow: 
        -2px -2px 5px rgba(0,0,0, 0.4) inset, 
        2px 2px 5px rgba(0,0,0, 0.7) inset;
    }    
  }
  
  & .button::after {
    font-family: Pretendo, sans-serif;
    font-size: 12px;
    color: #302058;
    content: attr(data-button);
    position: relative;
    right: 0;
    bottom: -20px;
  }  
}

/* Gameboy bottom body part */
.gameboy > .bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  left: -20px;
}

.speaker {
  display: flex;
  width: 120px;
  justify-content: space-around;
  position: absolute;
  right: 15px;
  bottom: 35px;
  transform: rotate(-30deg);
  
  &::after {
    content: "";
    width: 200px;
    height: 60px;
    position: absolute;
    background: rgba(0,0,0, 0.1);
    top: 50px;
  }
  
  & .band {
    width: 8px;
    height: 60px;
    border-radius: 8px;
    box-shadow: 3px 6px 1px rgba(0,0,0, 0.6) inset;
    background: rgba(0,0,0, 0.35);
  }
}

.phones {
  font-family: Arial, sans-serif;
  font-size: 10px;
  opacity: 0.5;
  text-align: center;
  border: 1px solid #aaa;
  border-radius: 40px;
  padding: 2px 6px;
  box-shadow: 0 0 5px rgba(0,0,0, 0.5) inset;
  margin-bottom: 10px;
}
              
            
!

JS

              
                const startup = new Audio('https://manzdev.github.io/cursos-assets/html5/nintendo/startup.mp3');
let timer;

const dom = {
  power: document.querySelector('.power'),
  led: document.querySelector('.led'),
  gamescreen: document.querySelector('.gamescreen'),
}

dom.power.addEventListener('click', function() {
  this.classList.toggle('on');
  dom.led.classList.toggle('on');
  dom.gamescreen.classList.toggle('startup');
  
  if (this.classList.contains('on'))
    timer = setTimeout( () => startup.play() , 2100);
});
              
            
!
999px

Console