.to-top {
  padding: 20px;
  /*background-color: #bdc3c7;*/
  background-color: #bdc3c7;
  width: 60px;
  height: 60px;
  float: right;
  position: fixed;
  bottom: 0;
  right: 0;
  margin-right: 100px;
  margin-bottom: 25px;
  opacity: 0;
  
  transition: all .8s ease;
}
.to-top:hover {
  box-shadow: 0 0 10px #333;
}
.to-top:before {
  content: "";
  display: block;
  margin: 0 auto;
	width: 0; 
	height: 0; 
  position: relative;
  right: 4px;
  bottom: 2px;
	border-left: 15px solid transparent;
	border-right: 15px solid transparent;
	
	border-bottom: 20px solid #16a085;

}

.visible {
  opacity: 1;
}