From kodeboard, 4 Years ago, written in CSS.
Embed
  1. .icon-large.icon-twitter {
  2.     background-attachment: scroll;
  3.     background-clip: border-box;
  4.     background-color: transparent;
  5.     background-image: url("data:image/png;base64,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");
  6.     background-origin: padding-box;
  7.     background-repeat: no-repeat;
  8.     background-size: auto auto;
  9.     top: 50%;
  10. }
  11. .icon-twitter {
  12.     background-position: -24px 0;
  13.     height: 16px;
  14.     left: 4px;
  15.     width: 21px;
  16.     line-height:16px;
  17. }
  18. <a href="http://www.twitter.com" class="btn"><i class="icon icon-large icon-twitter"></i> Tweet</a>
  19.  

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