#btn-back-to-top {
  background: rgba(168, 168, 168, .14);
   -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  
  -webkit-box-shadow: 0 0 2px .6px #171717;
    -moz-box-shadow: 0 0 2px .6px #171717;
    box-shadow: 0 0 2px .6px #171717;
  
  color: #171717;
  border-radius: 0px; /* Rounded corners */
  border: 1px solid rgba(255, 0, 0, 0);
  padding: 12px;
  
  cursor: pointer; /* Add a mouse pointer on hover */
  
  /* display: none; /* Hidden by default */
  transition: opacity 0.35s ease-in-out;
  /* opacity: 0; */
  opacity: 0;
  
  position: fixed;
  z-index: 1000;
  right: 2rem;
  bottom: 2rem;
}

#btn-back-to-top img {
  padding-bottom: 4px;
}


#btn-back-to-top:hover {
  transform: translate3d(0px, -8px, 0px);
  transition: all .5s ease;
}


html {
  scroll-behavior: smooth;
}