.topAni {

  width: 70px;
  height: 70px;
  background: url('../img/spritesheet_top.png') left center;

}

@keyframes topsheet {
   100% { background-position: -1330px; }
}

.topHoverGray {
  position: relative;
  width: 250px;
  height: 70px;
  margin: 0 auto;
  margin-top: 15vh;
  bottom: 0;


}

.topHoverGray:hover .topAni {
  animation: topsheet 0.6s steps(19) infinite;
  animation-fill-mode: forwards;

  cursor: pointer;
}

#backToTop {
  float: left;
  font-family: primeLight;
  font-size: 1.5em;
  margin-top: -50px;
  margin-left: 100px;
  color: #252a2c;
}

#backToTop a:visited {
color: #252a2c;
}