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HTML

              
                .explanation

  .original
    
    %h3
      Original
  
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    <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
    width="48px" height="48px" viewBox="0 0 48 48" enable-background="new 0 0 48 48" xml:space="preserve">
    <g id="BG_-_circle_99_">
    <g>
    <circle fill="#A4BE60" cx="24" cy="24" r="24"/>
    </g>
    </g>
    <g id="Envelope_base">
    <g>
    <path fill="#FFFFFF" d="M37,14H11c-1.104,0-2,0.896-2,2v17c0,1.104,0.896,2,2,2h26c1.104,0,2-0.896,2-2V16
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    <g id="Shade">
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    <?xml version="1.0" encoding="utf-8"?>
    <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
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    <g id="Bubbles_1_" opacity="0.302">
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    c-0.553,0-1,0.447-1,1s0.447,1,1,1s1-0.447,1-1S22.553,28,22,28z M24,24c-0.553,0-1,0.447-1,1s0.447,1,1,1s1-0.447,1-1
    S24.553,24,24,24z"/>
    </g>
    </g>
    </svg>
  
    <?xml version="1.0" encoding="utf-8"?>
    <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
    width="48px" height="48px" viewBox="0 0 48 48" enable-background="new 0 0 48 48" xml:space="preserve">
    <g id="BG_-_circle_52_">
    <g>
    <circle fill="#D3524C" cx="24" cy="24" r="24"/>
    </g>
    </g>
    <g id="Handle_9_">
    <g>
    <path fill="#C8C7C7" d="M30.82,23.592v2.364c0,0,4.762-1.22,4.762,1.183c0,7.095-11.905,7.058-11.905,7.058v2.365
    c0,0,14.323,0,14.323-9.423C38,21.227,30.82,23.592,30.82,23.592z"/>
    </g>
    </g>
    <g id="Cup">
    <g>
    <path fill="#F5F6F6" d="M32,21H13c0,0,0,2.156,0,2.573C13,31.399,15.381,39,22.523,39c7.106,0,9.524-7.601,9.524-15.427
    C32.048,23.083,32,21,32,21z"/>
    </g>
    </g>
    <g id="Steam" opacity="0.502">
    <g>
    <path fill="#F5F6F6" d="M24.887,11.873c1.551-3.309-2.487-4.885-2.487-4.885s1.992,2.226,0.354,4.229
    c-0.715,0.874-2.232,1.976-2.352,3.108c-0.379,3.6,3.71,5.227,3.71,5.227s-1.823-1.265-1.256-4.414
    C23.047,14.079,24.455,12.796,24.887,11.873z"/>
    </g>
    </g>
    </svg>
    
  %h3
    Customized
  
  <?xml version="1.0" encoding="utf-8"?>
  <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
  width="48px" height="48px" viewBox="0 0 48 48" enable-background="new 0 0 48 48" xml:space="preserve">
  <g id="BG_-_circle_99_">
  <g>
  <circle class="flatties-bg--email" fill="#A4BE60" cx="24" cy="24" r="24"/>
  </g>
  </g>
  <g id="Envelope_base">
  <g>
  <path fill="#FFFFFF" d="M37,14H11c-1.104,0-2,0.896-2,2v17c0,1.104,0.896,2,2,2h26c1.104,0,2-0.896,2-2V16
  C39,14.896,38.104,14,37,14z"/>
  </g>
  </g>
  <g id="Shade">
  <g>
  <path fill="#E8E8E8" d="M24,28L9,16v17c0,1.104,0.896,2,2,2h26c1.104,0,2-0.896,2-2V16L24,28z"/>
  </g>
  </g>
  <g id="Crease_1_">
  <g>
  <polygon fill="#C1C0C0" points="24,26 9.11,16 23.982,28.519 38.819,16     "/>
  </g>
  </g>
  </svg>
  
  <?xml version="1.0" encoding="utf-8"?>
  <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
  width="48px" height="48px" viewBox="0 0 48 48" enable-background="new 0 0 48 48" xml:space="preserve">
  <g id="BG_-_circle_79_">
  <g>
  <circle class="flatties-bg--beer" fill="#D3524D" cx="24" cy="24" r="24"/>
  </g>
  </g>
  <g id="Glass_3_" opacity="0.6392">
  <g>
  <path fill="#FFFFFF" d="M28.723,35.714L31,15H16l2.277,20.714c0,0-0.852,0.63-1.121,1.179c-0.29,0.593,0,1.107,0,1.107h12.723
  c0,0,0.287-0.54,0-1.107C29.588,36.316,28.723,35.714,28.723,35.714z"/>
  </g>
  </g>
  <g id="Peroni">
  <g>
  <polygon fill="#D68333" points="18,18 20,36 27,36 29,18     "/>
  </g>
  </g>
  <g id="Head">
  <g>
  <path fill="#FFFFFF" d="M23.663,15C20.859,15,18,15,18,15v3h11v-3C29,15,26.357,15,23.663,15z"/>
  </g>
  </g>
  <g id="Bubbles_1_" opacity="0.302">
  <g>
  <path fill="#FFFFFF" d="M23.5,32c-0.276,0-0.5,0.224-0.5,0.5s0.224,0.5,0.5,0.5s0.5-0.224,0.5-0.5S23.776,32,23.5,32z M22,28
  c-0.553,0-1,0.447-1,1s0.447,1,1,1s1-0.447,1-1S22.553,28,22,28z M24,24c-0.553,0-1,0.447-1,1s0.447,1,1,1s1-0.447,1-1
  S24.553,24,24,24z"/>
  </g>
  </g>
  </svg>
  
  <?xml version="1.0" encoding="utf-8"?>
  <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
  width="48px" height="48px" viewBox="0 0 48 48" enable-background="new 0 0 48 48" xml:space="preserve">
  <g id="BG_-_circle_52_">
  <g>
  <circle class="flatties-bg--coffee" fill="#D3524C" cx="24" cy="24" r="24"/>
  </g>
  </g>
  <g id="Handle_9_">
  <g>
  <path  class="flatties-coffee-handle" fill="#C8C7C7" d="M30.82,23.592v2.364c0,0,4.762-1.22,4.762,1.183c0,7.095-11.905,7.058-11.905,7.058v2.365
  c0,0,14.323,0,14.323-9.423C38,21.227,30.82,23.592,30.82,23.592z"/>
  </g>
  </g>
  <g id="Cup">
  <g>
  <path fill="#F5F6F6" d="M32,21H13c0,0,0,2.156,0,2.573C13,31.399,15.381,39,22.523,39c7.106,0,9.524-7.601,9.524-15.427
  C32.048,23.083,32,21,32,21z"/>
  </g>
  </g>
  <g id="Steam" opacity="0.502">
  <g>
  <path fill="#F5F6F6" d="M24.887,11.873c1.551-3.309-2.487-4.885-2.487-4.885s1.992,2.226,0.354,4.229
  c-0.715,0.874-2.232,1.976-2.352,3.108c-0.379,3.6,3.71,5.227,3.71,5.227s-1.823-1.265-1.256-4.414
  C23.047,14.079,24.455,12.796,24.887,11.873z"/>
  </g>
  </g>
  </svg>
  
  %h1 SVG Custom Flatties
  
  %p
    Font icons are rad because you can easily style them with CSS. The drawback is that you are restricted to basic things that CSS can do and applying those styles to the whole element.
  
  %p
    I thought it'd be worthwhile to try directly working with the SVGs for a hybrid approach. I'm going to mess with the
    %a(href="https://creativemarket.com/uiparade/4823-Flatties-flat-style-icon-set") Flatties Icon Set
    to see if you could customize all (well, all of a sub-set) of the backgrounds with a base class.
              
            
!

CSS

              
                @import compass

// -------------------------------------
//   Tinkering Base
// -------------------------------------

.explanation
  line-height: 1.5
  margin: 2em auto 0
  max-width: 700px
  width: 87.5%
  
  
// Just cause I hate the visited purple link.
a
  color: #b51f24

// -------------------------------------
//   Flatties
// -------------------------------------

// This applies an opacity change on hover, but is done to the whole SVG because otherwise you lose the hover when you're on internal elements.

svg:hover
  .flatties-bg
    fill-opacity: 0.6
    
// This sets a fill color and opacity level for the circles of the icons.

.flatties-bg
  fill: #e8c04f
  fill-opacity: 0.8
  
.flatties-bg--email
  @extend .flatties-bg
  
.flatties-bg--beer
  @extend .flatties-bg
  
.flatties-bg--coffee
  @extend .flatties-bg
    
// It can be applied to any piece of the SVG. Like the handle is too light on the yellow.

.flatties-coffee-handle
  fill: #ab8518
   
              
            
!

JS

              
                
              
            
!
999px

Console