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HTML 

              
                <div class="wrapper">
  
  <div class="intro">
    <h1>Animated CSS3 USB Drives</h1>
  </div>
  
  <div class="drives">
    
    <!-- Blue USB Drive -->
    <a class="usb-drive" href="#" title="Download">
      <div class="casing">Download</div>
      <div class="connector">
        <div class="inner">
          <span aria-hidden="true"></span>
          <span aria-hidden="true"></span>
        </div>
      </div>
      <div class="cap">
        <i class="fa fa-cloud-download"></i>
      </div>
    </a>
    
    <!-- Purple USB Drive -->
    <a class="usb-drive purple" href="#" title="Download">
      <div class="casing">Download</div>
      <div class="connector">
        <div class="inner">
          <span aria-hidden="true"></span>
          <span aria-hidden="true"></span>
        </div>
      </div>
      <div class="cap">
        <i class="fa fa-download"></i>
      </div>
    </a>
    
    <!-- Red USB Drive -->
    <a class="usb-drive red" href="#" title="Share">
      <div class="casing">Share</div>
      <div class="connector">
        <div class="inner">
          <span aria-hidden="true"></span>
          <span aria-hidden="true"></span>
        </div>
      </div>
      <div class="cap">
        <i class="fa fa-share"></i>
      </div>
    </a>
    
    <!-- Orange USB Drive -->
    <a class="usb-drive orange" href="#" title="Upload">
      <div class="casing">Upload</div>
      <div class="connector">
        <div class="inner">
          <span aria-hidden="true"></span>
          <span aria-hidden="true"></span>
        </div>
      </div>
      <div class="cap">
        <i class="fa fa-cloud-upload"></i>
      </div>
    </a>
    
    <!-- Green USB Drive -->
    <a class="usb-drive green" href="#" title="Download">
      <div class="casing">Upload</div>
      <div class="connector">
        <div class="inner">
          <span aria-hidden="true"></span>
          <span aria-hidden="true"></span>
        </div>
      </div>
      <div class="cap">
        <i class="fa fa-upload"></i>
      </div>
      
      <!-- Carbon Pattern USB Drive -->
      <a class="usb-drive carbon" href="#" title="Stash">
        <div class="casing">Stash</div>
        <div class="connector">
          <div class="inner">
            <span aria-hidden="true"></span>
            <span aria-hidden="true"></span>
          </div>
        </div>
        <div class="cap">
          <i class="fa fa-star"></i>
        </div>
      </a>
    </div>
    
    <div class="outro">
      <p>CSS experiment to make buttons that look like USB drives. <br />The goal was to make them without using images, purely HTML &amp; CSS.</p>
      <p><strong>Hover and click to see them in action.</strong></p>
      <p>The final carbon example uses a <a href="http://lea.verou.me/css3patterns/" title="CSS3 patterns">CSS3 pattern</a>.</p>
      <p>Standalone code can be found on <a href="https://github.com/johnslipper/animated-usb-drive-styled-links" title="View code on GitHub" target="_blank">GitHub</a></p>
    </div>
    
  </div><!-- /wrapper -->
!

CSS 

              
                /* Variables
------------ */
@gray: #555;
@grayLight: #999;
@grayDark: #333;
@orange: #f89406;
@purple: #7a43b6;
@yellow: #ffc40d;
@green: #46a546;
@red: #a22218;


/* Layout styles
---------------- */
.wrapper {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  width: 740px;
  margin: 40px auto;
  text-align: center;
}

.intro {
  margin-bottom: 20px;
}

.outro {
  margin-top: 40px;
}

.drives {
  .clearfix();
}


/* USB drive base styles
------------------------ */

.usb-drive {
  display: block;
  float: left;
  width: 246px; /* Open size plus casing margin */
  margin: 25px auto;
  text-align: left;
  cursor: pointer;
  .usb-drive-color();
  .clearfix();
  user-select: none; /* Stop text from being highlighted */
  font-smoothing: antialiased;
  & > div {
    float: left;
    height: 50px;
  }
  .casing, .cap {
    line-height: 50px;
    text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.65), 0 1px 1px rgba(255, 255, 255, 0.35);
  }
  .casing {
    width: 95px;
    margin-left: 36px; /* Offset by width of connector for centering */
    padding-left: 15px;
    padding-right: 10px;
    border-radius: 25px 0 0 25px;
    font-size: 16px;
    font-weight: bold;
    text-align: center;
  }
  .connector {
    width: 0;
    position: relative;
    overflow: hidden;
    transition: width 100ms ease-in-out;
    .inner {
      margin-top: 12px;
      width: 30px;
      height: 30px;
      border-radius:0 2px 2px 0;
      #gradient > .vertical-three-colors(@grayLight, lighten(@grayLight, 15%), 90%, lighten(@gray, 10%));
      box-shadow: inset 3px 0 3px rgba(0,0,0,0.15), 0 5px 0 darken(@gray, 10%), inset 0 2px 1px rgba(255, 255, 255, 0.45), 0 5px 10px rgba(0, 0, 0, 0.65);
      span {
        position: absolute;
        width: 5px;
        height: 5px;
        left: 7px;
        background-color: @grayDark;
        border-radius: 1px;
        box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.65), 0 1px 0 rgba(255, 255, 255, 0.35);
        &:first-of-type {
          top: 19px;
        }
        &:last-of-type {
          top: 29px;
        }
      }
    }
 }
  
	.cap {
    width: 36px;
    padding-left: 10px;
    border-radius: 0 25px 25px 0;
    font-size: 18px;
  }
  /* active state */
  &:active, &.active {
    text-decoration: none;
    .casing, .cap {
      color: #FFF;
    }
  }
  /* hover state */
  &:hover, &.hover {
    .connector {
      width: 35px;
    }
  }
}


/* USB Drive Colouring
---------------------- */
.usb-drive-color(@driveColor: #04aef4) {
  .casing, .cap {
    color: darken(@driveColor, 15%);
    background-color: @driveColor;
    border-top: 1px solid @driveColor;
    border-bottom: 1px solid lighten(@driveColor, 5%);
    box-shadow: 0 5px 0 darken(@driveColor, 20%), inset 0 2px 1px rgba(255, 255, 255, 0.35), 0 8px 3px rgba(0, 0, 0, 0.35);
    #gradient > .vertical(lighten(@driveColor, 10%), darken(@driveColor, 8%));
  }
}

.red {
  .usb-drive-color(lighten(@red, 5%));
}

.orange {
  .usb-drive-color(saturate(@orange, 5%));
}

.purple {
  .usb-drive-color(saturate(@purple, 5%));
}

.green {
  .usb-drive-color(saturate(@green, 5%));
}

/* Carbon example pattern from
   http://lea.verou.me/css3patterns/
------------------------------------ */
.carbon .casing,
.carbon .cap {
  color: #CCC;
  background: linear-gradient(27deg, #222222 5px, transparent 5px) 0 5px, linear-gradient(207deg, #222222 5px, transparent 5px) 10px 0px, linear-gradient(27deg, #2f2f2f 5px, transparent 5px) 0px 10px, linear-gradient(207deg, #2f2f2f 5px, transparent 5px) 10px 5px, linear-gradient(90deg, #282828 10px, transparent 10px), linear-gradient(#2a2a2a 25%, #1a1a1a 25%, #272727 50%, transparent 50%, transparent 75%, #313131 75%, #313131);
  background-color: #202020;
  -webkit-background-size: 20px 20px;
  -moz-background-size: 20px 20px;
  -o-background-size: 20px 20px;
  background-size: 20px 20px;
  -webkit-box-shadow: 0 5px 0  #000000 , inset 0 2px 1px rgba(255, 255, 255, 0.35), 0 8px 3px rgba(0, 0, 0, 0.35);
  -moz-box-shadow: 0 5px 0  #000000 , inset 0 2px 1px rgba(255, 255, 255, 0.35), 0 8px 3px rgba(0, 0, 0, 0.35);
  box-shadow: 0 5px 0  #000000 , inset 0 2px 1px rgba(255, 255, 255, 0.35), 0 8px 3px rgba(0, 0, 0, 0.35);
  border-top: 1px solid #333333;
  border-bottom: 1px solid #404040;
}

.carbon .cap {
  color: #ffc40d;
}


/* Font Awesome styles
---------------------- */
@import url("//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css");



/* Utility Mixins (Twitter Bootstrap 2.3)
----------------------------------------- */
#gradient {
  .vertical(@startColor: #555, @endColor: #333) {
    background-color: mix(@startColor, @endColor, 60%);
    background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(top, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(top, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
    background-repeat: repeat-x;
  }
  .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
    background-color: mix(@midColor, @endColor, 80%);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
    background-image: -webkit-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: -moz-linear-gradient(top, @startColor, @midColor @colorStop, @endColor);
    background-image: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-repeat: no-repeat;
  }
}

.clearfix {
  &:before,
  &:after {
    display: table;
    content: "";
    line-height: 0;
  }
  &:after {
    clear: both;
  }
}

/* Responsive Tweaks
-------------------- */
@media (min-width: 492px) and (max-width: 739px) {
  
  .wrapper {
    width: 492px;
  }
  
}

@media (max-width: 491px) {
  
  .wrapper {
    width: auto;
    margin: auto;
  }
  
  .usb-drive {
    float: none;
  }
  
}
!

JS
!
999px

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