.backtotop {
    display: inline-block;
    background-color: $primaryColor;  
    width: 40px;
    height: 40px;
    text-align: center;
    border-radius: 4px;
    position: fixed;
    bottom: 20px; 
    right: 20px;  
    opacity: 0;
    visibility: hidden; 
    z-index: 9999999999;  
} 
.backtotop::after {
  content: "\f077";
  font-family: FontAwesome;
  font-weight: normal;
  font-style: normal;
  font-size: 1.5em;
  line-height: 40px;
  color: #fff;  
}
  .backtotop:hover {
    cursor: pointer;
    background-color: #000000;  
  }
  .backtotop:active { 
    background-color: #000000;
  }
  .backtotop.show {
    opacity: 1;
    visibility: visible;
  }