<a href="#" class="button">l</a><a href="#" class="button active">l</a><a href="#" class="button">l</a>

html, body {
  background: #f3efef;
  text-align: center;
  font-family: 'fontello';
  border: 6px solid #f3efef;
  height: 100%;
}

.blinking {
  border-color: #00d07f;
}

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
}

.button {
  display: inline-block;
  vertical-align: middle;
  -webkit-transform: scale(1.25);
  margin: 110px 30px;
  width: 60px;
  height: 60px;
  line-height: 2.6;
  font-size: 24px;
  color: #e1dada;
  text-shadow: 0px -1px 1px rgba(0, 0, 0, 0.2);
  border-radius: 100px;
  text-decoration: none;
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #f4f4f4), color-stop(100%, #e3e3e3));
  background-image: -moz-gradient(linear, left top, left bottom, color-stop(0%, #f4f4f4), color-stop(100%, #e3e3e3));
  box-shadow: 0px 0px 2px rgba(0, 0, 0, 0.25), 10px 10px 15px #e3e3e3, -10px 10px 15px #e3e3e3, -15px -15px 15px rgba(255, 255, 255, 0.4), 15px -15px 15px rgba(255, 255, 255, 0.4), inset 0px 2px 0px white;
  -webkit-transition: box-shadow 0.3s ease-in-out,  background-image 0.3s ease-in-out, text-shadow 0.5s linear, color 0.5s linear;
  -moz-transition: box-shadow 0.3s ease-in-out,  background-image 0.3s ease-in-out, text-shadow 0.5s linear, color 0.5s linear;
}
.button.active {
  color: #00d0b0;
  text-shadow: 0px 0px 7px #37ffb1;
  background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #e3e3e3), color-stop(100%, #f4f4f4));
  background-image: -moz-gradient(linear, left top, left bottom, color-stop(0%, #e3e3e3), color-stop(100%, #f4f4f4));
  box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.15), 10px 10px 15px rgba(255, 255, 255, 0.4), -10px 10px 15px rgba(255, 255, 255, 0.4), -10px -10px 15px #e3e3e3, 10px -10px 15px #e3e3e3, inset 0px -3px 0px rgba(255, 255, 255, 0.4), inset 0px 3px 3px rgba(0, 0, 0, 0.04);
}