h2::after, h3::after {
    content: "#";
    position: relative;
    top: 0em;
    left: 0.5em;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s;
}
h2::after {font-size: 1.4em;}
h3::after {font-size: 1.2em;}

h2:hover::after, h3:hover::after {
    visibility: visible;
    opacity: 1;
}

div.backButton{
  position:fixed; 
  top:80%;
  right: 5%;
}