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.transparent-border { 
  -moz-background-clip: padding;     /* Firefox 3.6 */
  -webkit-background-clip: padding;  /* Safari 4? Chrome 6? */
  background-clip: padding-box;      /* Firefox 4, Safari 5, Opera 10, IE 9 */
         
  border: 20px solid rgba(0,0,0,0.3);
        
  -webkit-border-radius: 40px;
  -moz-border-radius: 40px;
  border-radius: 40px;
}