<a href="https://twitter.com/fiveraNet" class="icon-button twitter" target="_blank" title="Twitter"><i class="icon-twitter"></i><span></span></a>
<a href="https://www.facebook.com/fivera.net"target="_blank" title="Facebook" class="icon-button facebook"><i class="icon-facebook"></i><span></span></a>
<a href="https://plus.google.com/111830765940414358275/posts"target="_blank" title="Google plus" class="icon-button google-plus"><i class="icon-google-plus"></i><span></span></a>
<a href="https://pinterest.com/fivera" target="_blank" title="Pinterest" class="icon-button pinterest"><i class="icon-pinterest"></i><span></span></a>
<a href="mailto:fivera.rs@gmail.com?Subject=Hello%20Fivera"  title="Send an email" class="icon-button envelope-alt"><i class="icon-envelope-alt"></i><span></span></a>
html {
	font-size: 20px;
}
body {
	background-color: #2A2B2C;
	padding: 50px;
	text-align: center;
}

/* Wrapper */
.icon-button {
	border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 0 0 30px transparent;
  background: rgba(255, 255, 255, 0.1);
	cursor: pointer;
	display: inline-block;
	font-size: 2.0rem;
	height: 3.6rem;
	line-height: 3.6rem;
	margin: 0 5px;
	position: relative;
	text-align: center;
	-webkit-user-select: none;
	   -moz-user-select: none;
	    -ms-user-select: none;
	        user-select: none;
	width: 3.6rem;
}

.icon-button:hover{
  background-color: #2a3036;
  color: white;
  border: 1px solid #fff;
  box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.2);
  -webkit-transition: box-shadow 0.4s ease-in-out, border-color 0.4s ease-in;
  -moz-transition: box-shadow 0.4s ease-in-out, border-color 0.4s ease-in;
  -o-transition: box-shadow 0.4s ease-in-out, border-color 0.4s ease-in;
  -ms-transition: box-shadow 0.4s ease-in-out, border-color 0.4s ease-in;
  transition: box-shadow 0.4s ease-in-out, border-color 0.4s ease-in;
}
/* Circle */
.icon-button span {
	border-radius: 0;
	display: block;
	height: 0;
	left: 50%;
	margin: 0;
	position: absolute;
	top: 50%;
	-webkit-transition: all 0.3s;
	   -moz-transition: all 0.3s;
	     -o-transition: all 0.3s;
	        transition: all 0.3s;
	width: 0;
}
.icon-button:hover span {
	width: 3.6rem;
	height: 3.6rem;
	margin: -1.8rem;
}
.twitter span {
	background-color: #4099ff;
}
.facebook span {
	background-color: #3B5998;
}
.google-plus span {
	background-color: #db5a3c;
}

.pinterest span {
	background-color: #C92228;
}
.envelope-alt span {
	background-color: #69d376;
}


/* Icons */
.icon-button i {
	background: none;
	color: white;
	height: 3.6rem;
	left: 0;
	line-height: 3.6rem;
	position: absolute;
	top: 0;
	-webkit-transition: all 0.3s;
	   -moz-transition: all 0.3s;
	     -o-transition: all 0.3s;
	        transition: all 0.3s;
	width: 3.6rem;
	z-index: 10;
}
.icon-button .icon-twitter {
	color: #4099ff;
}
.icon-button .icon-facebook {
	color: #3B5998;
}
.icon-button .icon-google-plus {
	color: #db5a3c;
}
.icon-button .icon-pinterest {
	color: #C92228;
}
.icon-button .icon-envelope-alt {
	color: #000000;
}
.icon-button:hover .icon-twitter,
.icon-button:hover .icon-facebook,
.icon-button:hover .icon-google-plus,
.icon-button:hover .icon-pinterest,
.icon-button:hover .icon-envelope-alt {
	color: white;
}

External CSS

  1. https://netdna.bootstrapcdn.com/font-awesome/3.1.1/css/font-awesome.css

External JavaScript

This Pen doesn't use any external JavaScript resources.