html {
  height: 100%;
}

body {
  background: radial-gradient(ellipse at center,  rgba(55,178,230,1) 20%,rgba(0,157,223,1) 100%);
}

.button {
  color: #fff;
  font-family: sans-serif;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  line-height: 50px;
  
  position: relative;
  display: block;
  height: 50px;
  width: 200px;
  margin: 5% auto;
  border: 1px solid #fff;
}

.button span, .button i {
  display: inline-block;
  z-index: 100;
}

.button i {
  font-style: normal;
}

.backgroundHover {
  position: absolute;
  top: 0; left: 0;
  height: 100%; width: 100%;
}

.backgroundHover {
	z-index: -1;
  background: #fff;
}