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HTML

              
                <div class="glossy-selectbox">
    <input type="checkbox">
    <label data-default="Share This Post!" data-focus="Select one of the social media service..."></label>
    <ul>
        <li><a class="social-rss" href="#" target="_blank">RSS Feed</a></li>
        <li><a class="social-facebook" href="#" target="_blank">Facebook</a></li>
        <li><a class="social-twitter" href="#" target="_blank">Twitter</a></li>
        <li><a class="social-google" href="#" target="_blank">Google+</a></li>
    </ul>
</div>
              
            
!

CSS

              
                body {
  padding:120px 0;
  text-align:center;
  background-color:#222;
  background-image:radial-gradient(50% 50%,#333,#111);
}

/**
 * Pure CSS3 (with some data URI images for the social media icons) Drop Down Menu for Social Media Sharing
 * Author: Taufik Nurrohman
 * URL: https://plus.google.com/108949996304093815163/about
 */

.glossy-selectbox {
  display:inline-block;
  font:normal bold 12px Arial,Sans-Serif;
  position:relative;
  width:300px;
  background-color:#111;
  text-align:left;
  /* CSS3 Browser */
  background-image:linear-gradient(top,rgba(255,255,255,.4) 0%,rgba(255,255,255,.2) 50%,rgba(255,255,255,0) 50%,rgba(255,255,255,.1) 100%);
  /* IE only */
  filter:progid:DXImageTransform.Microsoft.gradient(gradientType=0,startColorstr='#333333',endColorstr='#111111');
  border-radius:7px;
  box-shadow:inset 0 1px 1px 1px rgba(255,255,255,.1), 0 1px 3px rgba(0,0,0,.7);
}

.glossy-selectbox:before,
.glossy-selectbox:after {
  content:"";
  display:block;
  width:0;
  height:0;
  border:3px solid transparent;
  border-width:5px 3px;
  border-bottom-color:#999;
  position:absolute;
  top:25%;
  right:5px;
  z-index:4;
}

.glossy-selectbox:after {
  border-color:#999 transparent transparent;
  top:auto;
  bottom:25%;
}

.glossy-selectbox input {
  display:block;
  position:absolute;
  top:0;
  right:0;
  bottom:0;
  width:15px;
  height:100%;
  opacity:0;
  z-index:10;
  cursor:pointer;
}

.glossy-selectbox label {
  display:block;
  line-height:45px;
  color:rgba(255,255,255,.5);
  padding:0 15px;
  transition:all 0s ease-out;
}

.glossy-selectbox label:before {
  content:attr(data-default);
}

.glossy-selectbox label:after {
  content:"";
  display:block;
  position:absolute;
  top:0;
  right:0;
  bottom:0;
  width:15px;
  border-left:1px solid rgba(0,0,0,.4);
  border-radius:0 7px 7px 0;
  box-shadow:inset 1px 0 0 rgba(255,255,255,.1),-1px 0 0 rgba(255,255,255,.1);
}

.glossy-selectbox input:hover + label {
  color:white;
}

.glossy-selectbox input:hover + label:after {
  background-color:rgba(255,255,255,.04);
}

.glossy-selectbox ul {
  margin:0 0;
  padding:0 0;
  position:absolute;
  top:100%;
  left:14px;
  right:14px;
  background-color:#222;
  border:1px solid #111;
  box-shadow:0 1px 2px rgba(0,0,0,.4),0 5px 7px -2px rgba(0,0,0,.4);
  visibility:hidden;
  opacity:0;
  z-index:99;
}

.glossy-selectbox li {
  margin:0 0;
  padding:0 0;
  list-style:none;
  float:left;
  width:50%;
  display:inline;
}

.glossy-selectbox a {
  display:block;
  position:relative;
  color:#999;
  text-decoration:none;
  text-shadow:0 0 2px black;
  line-height:30px;
  border-top:1px solid #111;
  border-right:1px solid #111;
  padding:0 15px 0 32px;
  box-shadow:inset 0 0 0 1px #333;
  /* Opera note: An unstable box shadow will appear if you don't define the border radius less than 1 pixel. Weird! */
  border-radius:1px;
}

.glossy-selectbox a:nth-child(even) {
  border-right-width:0;
}

.glossy-selectbox a:before {
  content:"";
  display:block;
  width:16px;
  height:16px;
  position:absolute;
  top:7px;
  left:7px;
  background-color:transparent;
  background-repeat:no-repeat;
  background-position:50% 0;
}

.glossy-selectbox a:hover:before {
  background-position:50% 100%;
}

.glossy-selectbox .social-rss:before      {background-image:url('data:image/png;base64,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')}
.glossy-selectbox .social-facebook:before {background-image:url('data:image/png;base64,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')}
.glossy-selectbox .social-twitter:before  {background-image:url('data:image/png;base64,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')}
.glossy-selectbox .social-google:before   {background-image:url('data:image/png;base64,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')}

.glossy-selectbox a:hover {
  background-color:rgba(0,0,0,.2);
  color:#ccc;
}

/* On click, then... */
.glossy-selectbox input:checked + label {
  color:rgba(255,255,255,.4);
  transition-duration:.4s;
}

.glossy-selectbox input:checked + label:before {
  content:attr(data-focus);
}

.glossy-selectbox input:checked + label:after {
  background-color:rgba(0,0,0,.2);
  box-shadow:inset 1px 0 1px rgba(0,0,0,.4),-1px 0 0 rgba(255,255,255,.1);
}

.glossy-selectbox input:checked ~ ul {
  visibility:visible;
  opacity:1;
}
              
            
!

JS

              
                
              
            
!
999px

Console