.goTop {
  border-radius: 5px;
  background-color: rgb(1,14,27);
  background-color: rgba(1, 14, 27, .7);
  position: fixed;
  width: 45px;
  height: 45px;
  display: block;
  right: 15px;
  bottom: 15px;
  border: none;
  opacity: 0;
  z-index: -1;
}

.goTop .fa {
    color: white;
    font-size: 22px;
}

 

.goTop:hover {
    opacity: 1;
    background-color: rgb(1,14,27);
    background-color: rgba(1, 14, 27, .9);
  }

.goTopIsVisible {
  opacity: .8;
  z-index: 4;
  transition: all .4s ease-in;
}

.zoom-in {
 cursor: zoom-in;
}
img[src=""] { visibility: hidden; }