<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">
<link href='https://fonts.googleapis.com/css?family=Lato' rel='stylesheet' type='text/css'>
<button class="btn btn-1 btn-sep icon-info">Button</button>
<button class="btn btn-2 btn-sep icon-cart">Button</button>
<button class="btn btn-3 btn-sep icon-heart">Button</button>
<button class="btn btn-4 btn-sep icon-send">Button</button>

/* General button style */
.btn {
  border: none;
  font-family: 'Lato';
  font-size: inherit;
  color: inherit;
  background: none;
  cursor: pointer;
  padding: 25px 80px;
  display: inline-block;
  margin: 15px 30px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
  outline: none;
  position: relative;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

.btn:after {
  content: '';
  position: absolute;
  z-index: -1;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

/* Pseudo elements for icons */
.btn:before {
  font-family: 'FontAwesome';
  speak: none;
  font-style: normal;
  font-weight: normal;
  font-variant: normal;
  text-transform: none;
  line-height: 1;
  position: relative;
  -webkit-font-smoothing: antialiased;
}


/* Icon separator */
.btn-sep {
  padding: 25px 60px 25px 120px;
}

.btn-sep:before {
  background: rgba(0,0,0,0.15);
}

/* Button 1 */
.btn-1 {
  background: #3498db;
  color: #fff;
}

.btn-1:hover {
  background: #2980b9;
}

.btn-1:active {
  background: #2980b9;
  top: 2px;
}

.btn-1:before {
  position: absolute;
  height: 100%;
  left: 0;
  top: 0;
  line-height: 3;
  font-size: 140%;
  width: 60px;
}

/* Button 2 */
.btn-2 {
  background: #2ecc71;
  color: #fff;
}

.btn-2:hover {
  background: #27ae60;
}

.btn-2:active {
  background: #27ae60;
  top: 2px;
}

.btn-2:before {
  position: absolute;
  height: 100%;
  left: 0;
  top: 0;
  line-height: 3;
  font-size: 140%;
  width: 60px;
}

/* Button 3 */
.btn-3 {
  background: #e74c3c;
  color: #fff;
}

.btn-3:hover {
  background: #c0392b;
}

.btn-3:active {
  background: #c0392b;
  top: 2px;
}

.btn-3:before {
  position: absolute;
  height: 100%;
  left: 0;
  top: 0;
  line-height: 3;
  font-size: 140%;
  width: 60px;
}

/* Button 3 */
.btn-4 {
  background: #34495e;
  color: #fff;
}

.btn-4:hover {
  background: #2c3e50;
}

.btn-4:active {
  background: #2c3e50;
  top: 2px;
}

.btn-4:before {
  position: absolute;
  height: 100%;
  left: 0;
  top: 0;
  line-height: 3;
  font-size: 140%;
  width: 60px;
}

/* Icons */

.icon-cart:before {
  content: "\f07a";
}

.icon-heart:before {
  content: "\f55a";
}

.icon-info:before {
  content: "\f05a";
}

.icon-send:before {
  content: "\f1d8";
}