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HTML

              
                .container
  .row
    .col-xs-4.col-xs-offset-4.text-center
      h1 HTML iMac (scalable)
      p
        input.form-control#size(placeholder='Base font-size, e.g. "20px"')
    .col-xs-8.col-xs-offset-2#wrap
      .imac
        img.img-responsive(src="https://unsplash.it/1600/900?image=1067")
        .icon
          i.fa.fa-apple
              
            
!

CSS

              
                @mac-gradient-start: #cccccc;
@mac-gradient-end: #eeeeee;

@mac-foot-gradient-stop1: #808080;
@mac-foot-gradient-stop2: #fafafa;
@mac-foot-gradient-stop3: #777777;
@mac-foot-gradient-stop4: #aaaaaa;
@mac-foot-gradient-stop5: #999999;
@mac-foot-gradient-stop6: #dddddd;

body,
.wrap {
  font-size: 16px;
}
.imac {
  background: @mac-gradient-start;
  background: -moz-linear-gradient(left, @mac-gradient-start 0%, @mac-gradient-end 100%);
  background: -webkit-linear-gradient(left, @mac-gradient-start 0%, @mac-gradient-end 100%);
  background: linear-gradient(to right, @mac-gradient-start 0%, @mac-gradient-end 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='@{mac-gradient-start}', endColorstr='@{mac-gradient-end}',GradientType=1 );
  border-radius: 0.8em;
  color: #000;
  height: 20.7em;
  margin: 0 auto 4.3em auto;
  perspective: 3em;
  position: relative;
  text-align: center;
  width: 30em;
  
  &::after {
    background: @mac-foot-gradient-stop1;
    background: -moz-linear-gradient(top, @mac-foot-gradient-stop1 0%, @mac-foot-gradient-stop2 54%, @mac-foot-gradient-stop2 56%, @mac-foot-gradient-stop3 73%, @mac-foot-gradient-stop3 75%, @mac-foot-gradient-stop4 85%, @mac-foot-gradient-stop5 95%,  @mac-foot-gradient-stop5 99%,  @mac-foot-gradient-stop6 99%);
    background: -webkit-linear-gradient(top, @mac-foot-gradient-stop1 0%, @mac-foot-gradient-stop2 54%,@mac-foot-gradient-stop2 56%, @mac-foot-gradient-stop3 73%, @mac-foot-gradient-stop3 75%, @mac-foot-gradient-stop4 85%, @mac-foot-gradient-stop5 95%, @mac-foot-gradient-stop5 99%, @mac-foot-gradient-stop6 99%);
    background: linear-gradient(to bottom,  @mac-foot-gradient-stop1 0%, @mac-foot-gradient-stop2 54%, @mac-foot-gradient-stop2 56%, @mac-foot-gradient-stop3 73%, @mac-foot-gradient-stop3 75%, @mac-foot-gradient-stop4 85%, @mac-foot-gradient-stop5 95%, @mac-foot-gradient-stop5 99%, @mac-foot-gradient-stop6 99%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='@{mac-foot-gradient-stop1}', endColorstr='@{mac-foot-gradient-stop6}',GradientType=0 );
    border-bottom: 0.1em solid @mac-foot-gradient-stop6;
    border-bottom-right-radius: 1.5em 0.1em;
    border-bottom-left-radius: 1.5em 0.1em;
    bottom: -2.3em;
    content: "";
    height: 1em;
    left: 50%;
    margin-left: -3.7em;
    position: absolute;
    transform: rotateX(65deg);
    width: 7.5em;
  }
  img {
    border: 1.2em solid #000;
    border-radius: 0.8em 0.8em 0 0;
    height: 18em;
    margin-bottom: 0.4em;
    width: 30em;

  }
  .icon {
    font-size: 1.5em;
  }
}
              
            
!

JS

              
                var bodyFontSize = document.getElementById("size");
var wrapper = document.getElementById("wrap");

bodyFontSize.addEventListener('keyup', function() {
  wrapper.style.fontSize = bodyFontSize.value;
}, false);
              
            
!
999px

Console