.topbtn{

  width:56px;
	opacity: 0.8;
}
.topbtn:hover{
	opacity: 1;
}


#goTop-rb {
	position: fixed;
  left: 50%;
  margin-top: -28px; /* Negative half of height. */
  margin-left: -28px; /* Negative half of width. */
	bottom: 2.5em;
	z-index:1;
}


@media(max-width:768px) {
	
	.topbtn{
		width:50px;
		opacity: 0.8;
	}
	.topbtn:hover{
		opacity: 1;
	}

	
	#goTop-rb {
		position: fixed;
		left: 50%;
    margin-top: -25px; /* Negative half of height. */
    margin-left: -25px; /* Negative half of width. */
		bottom: 2.5em;
		z-index:1;
	}

	
}




@media(max-width:480px) {
 
  #goTop-rb {

		bottom: 2em;

	}
  
}