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HTML

            
              
<div class="container">
  <h1 class="title">CSS Flexbox Apple Keyboard by <a href="//olex.co/">Olex</a></h1>
  <div class="keyboard">
    <div class="keyboard-row thin">
      <div class="key lowercase">Esc</div>
      <div class="key function lo-bright"><span>f1</span></div>
      <div class="key function hi-bright"><span>f2</span></div>
      <div class="key function expose"><span>f3</span></div>
      <div class="key function tilez"><span>f4</span></div>
      <div class="key function"><span>f5</span></div>
      <div class="key function"><span>f6</span></div>
      <div class="key function rewind"><span>f7</span></div>
      <div class="key function play-pause"><span>f8</span></div>
      <div class="key function ffwd"><span>f9</span></div>
      <div class="key function mute"><span>f10</span></div>
      <div class="key function lo-vol"><span>f11</span></div>
      <div class="key function hi-vol"><span>f12</span></div>
      <div class="key eject"></div>
    </div>
    <div class="keyboard-row">
      <div class="key"><span>~<br/>`</span></div>
      <div class="key"><span>!<br/>1</span></div>
      <div class="key"><span>@<br/>2</span></div>
      <div class="key"><span>#<br/>3</span></div>
      <div class="key"><span>$<br/>4</span></div>
      <div class="key"><span>%<br/>5</span></div>
      <div class="key"><span>^<br/>6</span></div>
      <div class="key"><span>&amp;<br/>7</span></div>
      <div class="key"><span>*<br/>8</span></div>
      <div class="key"><span>(<br/>9</span></div>
      <div class="key"><span>)<br/>0</span></div>
      <div class="key"><span>_<br/>-</span></div>
      <div class="key"><span>+<br/>=</span></div>
      <div class="key extra-size lowercase lower-right"><span class="lower-row-text">delete</span></div>
    </div>
    <div class="keyboard-row">
      <div class="key extra-size lowercase lower-left"><span class="lower-row-text">tab</span></div>
      <div class="key">Q</div>
      <div class="key">W</div>
      <div class="key">E</div>
      <div class="key">R</div>
      <div class="key">T</div>
      <div class="key">Y</div>
      <div class="key">U</div>
      <div class="key">I</div>
      <div class="key">O</div>
      <div class="key">P</div>
      <div class="key"><span>{<br/>[</span></div>
      <div class="key"><span>}<br/>]</span></div>
      <div class="key"><span>|<br/>\</span></div>
    </div>
    <div class="keyboard-row">
      <div class="key lowercase lower-left extra-size-two"><span class="lower-row-text">caps lock</span><span class="absolute-left caps-dot">&bull;</span></div>
      <div class="key">A</div>
      <div class="key">S</div>
      <div class="key">D</div>
      <div class="key">F</div>
      <div class="key">G</div>
      <div class="key">H</div>
      <div class="key">J</div>
      <div class="key">K</div>
      <div class="key">L</div>
      <div class="key"><span>:<br/>;</span></div>
      <div class="key"><span>"<br/>'</span></div>
      <div class="key extra-size-two lowercase lower-right"><span class="lower-row-text">return</span><span class="absolute-right">enter</span></div>
    </div>
    <div class="keyboard-row">
      <div class="key double-size lowercase lower-left"><span class="lower-row-text">shift</span></div>
      <div class="key">Z</div>
      <div class="key">X</div>
      <div class="key">C</div>
      <div class="key">V</div>
      <div class="key">B</div>
      <div class="key">N</div>
      <div class="key">M</div>
      <div class="key"><span>&lt;<br/>,</span></div>
      <div class="key"><span>&gt;<br/>.</span></div>
      <div class="key"><span>?<br/>/</span></div>
      <div class="key double-size lowercase lower-right"><span class="lower-row-text">shift</span></div>
    </div>
    <div class="keyboard-row bottom-row">
      <div class="key lower-left lowercase"><span class="lower-row-text">fn</span></div>
      <div class="key lower-left lowercase"><span class="lower-row-text">control</span></div>
      <div class="key lower-left lowercase"><span class="lower-row-text">option</span><span class="absolute-left">alt</span></div>
      <div class="key lower-center lowercase extra-size-two"><span class="lower-row-text">command</span><span class="absolute-right icon">&#8984;</span></div>
      <div class="key space-bar"></div>
      <div class="key lower-center lowercase extra-size-two"><span class="lower-row-text">command</span><span class="absolute-left icon">&#8984;</span></div>
      <div class="key lower-right lowercase"><span class="lower-row-text">option</span><span class="absolute-right">alt</span></div>
      <div class="arrows">
          <div class="key">&#9668;</div>
          <div class="up-down">
            <div class="key">&#9650;</div>
            <div class="key">&#9660;</div>
          </div>
          <div class="key">&#9658;</div>
        </div>
      </div>
    </div>
  </div>
</div>
!

CSS

            
              * {
  box-sizing: inherit;
}
body {
  box-sizing: border-box;
  background-color: #404049;
  font-family:'VAG Rounded W01 Thin';
}

.container {
  max-width: 816px;
  padding: 30px 8px 8px;
  margin: 60px auto;
  box-shadow: inset 1px 1px 0px #f1f1f1, 3px 3px 6px 3px #303038;
  background-color: #e3e3e3;
  border-radius: 1px 1px 7px 7px;
}

h1 {
  position: relative;
  top: -23px;
  left: 3px;
  height: 0;
  font-size: 12px;
  a {
    color: inherit;
    text-decoration: none;
    letter-spacing: 0.5px;
    &:hover {
      color: #ff8855;
      border-bottom: 1px solid;
    }
  }
}

.keyboard-row {
  display: flex;
}

@key-height: 30px;
.key {
  position: relative;
  display: inline-block;
  vertical-align: middle;
  text-align: center;
  padding: 3px 2px;
  height: @key-height;
  margin: 4px;
  letter-spacing: 0.5px;
  color: #3a3a3a;
  background-color: #f7f7f7;
  flex: 1;
  box-shadow: 
        inset 0 -2px 0 #aaaaaa,
    inset 0px 1px 1px -1px #fff,
        0px 1px 1px 0px #7a7a7a;
  border-radius: 3px;
  text-transform: uppercase;
  font-size: 14px;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  user-select: none;
  transition:
    transform 0.08s ease,
    background-color 0.08s ease,
    box-shadow 0.08s ease;
  cursor: pointer;
  
  &:hover {
    background-color: #fbfbfb;
  }
  
  &:active {
    transform: translateY(1.5px);
    box-shadow: 
        inset 0 -0.5px 0 #aaaaaa,
    inset 0px -1px 1px -1px #fff,
        0px 0.5px 0.75px 0px #999;
  }
  
  span {
    display: inline-block;
    vertical-align: middle;
  }
  
  &::before {
    display: inline-block;
    vertical-align: middle;
    height: 100%;
    content: '';
  }
  
  .keyboard-row.thin & {
    height: 20px; 
  }
  .keyboard-row.bottom-row & {
    height: 24px; 
  }
  
  @media (min-width: 640px) {
    height: 48px;
    .keyboard-row.thin & {
      height: 28px; 
    }
    .keyboard-row.bottom-row & {
      height: 55px; 
    }
  }
  
  &.extra-size {
    flex: 1.25;
  }
  &.extra-size-two {
    flex: 1.625;
  }
  &.double-size {
    flex: 2.125;
  }
  
  &.lowercase {
    font-size: 11px;
    text-transform: lowercase;
  }
  
  &.function {
    font-size: 8px;
    text-align: right;
  }
  
  &.function span {
    vertical-align: bottom;
  }
  
  &.lower-right {
    vertical-align: bottom;
    text-align: right;
    padding-right: 5px;
  }
  &.lower-left {
    vertical-align: bottom;
    text-align: left;
    padding-left: 5px;
  }
  &.lower-center {
    vertical-align: bottom;
  }
  
  &.space-bar {
    flex: 7.2;
  }
  
  .lower-row-text {
    vertical-align: bottom;
    padding-bottom: 2px;
  }
  
  .absolute-left ,
  .absolute-right {
    position: absolute;
    top: 5px;
    font-size: 9px;
    &.icon {
      font-size: 12px;
    }
  }
  .absolute-right {
    right: 5px;
  }
  .absolute-left {
    left: 5px;
    &.caps-dot {
      top: 3px;
      left: 4px;
    }
  }
}

.bottom-row .arrows {
  display: flex;
  flex: 4;
  justify-content: justify;
  align-items: flex-end;
  padding-bottom: 4px;
  
  .up-down {
    flex: 1.2;
    height: 54px;
    display: flex;
    flex-direction: column;
    margin-left: 4px;
    margin-right: 4px;

    .key {
      margin: 0;
    }
    
    .key:first-child {
      box-shadow: inset 0 -5px 4px -4px #aaaaaa,
            inset 0px 1px 1px -1px #fff,
        0px 1px 1px 0px #7a7a7a;
      border-bottom-left-radius: 1px;
      border-bottom-right-radius: 1px;
    }
    .key + .key {
      
      border-top-left-radius: 1px;
      border-top-right-radius: 1px;
    }
  }
  
  .key {
    flex: 1;
    font-size: 7px;
    margin: 0 4px;
    height: 27px;
    font-family: "Georgia", sans-serif;
    color: #555;
  }
}

/* function row icons */
.fn-row-icon {
  background-size: auto 60%;
  background-position: 50% 45%;
  background-repeat: no-repeat;
}

.eject, .lo-bright, .hi-bright, .expose, .tilez, .rewind, .ffwd, .play-pause, .mute, .lo-vol, .hi-vol, .eject {
  .fn-row-icon;
}

.rewind, .play-pause, .mute, .lo-vol, .hi-vol, .eject {
}

.eject {
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-01_1.svg);
}
.lo-bright {
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-10_1.svg);
}
.hi-bright {
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-09_1.svg);
}
.expose{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-08_1.svg);
}
.tilez{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-07_1.svg);
}
.rewind{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-06_1.svg);
}
.ffwd{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-04_1.svg);
}
.play-pause{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-05_1.svg);
}
.mute{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-11.svg);
}
.lo-vol{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-03_1.svg);
}
.hi-vol{
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-02_1.svg);
}
.eject {
  background-image: url(//s3-us-west-2.amazonaws.com/s.cdpn.io/8533/apple-icons-01_1.svg);
}
!

JS
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