.back_to_top_button{
    position:fixed;
    bottom:60px;
    right:60px;
    font-size:3em;
    color: var(--secondaryColor);
    cursor:pointer;
    z-index:801;
}
.back_to_top_button i{
    --fa-primary-color: #fff;
    --fa-primary-opacity: 1;
    --fa-secondary-color: var(--secondaryColor);
    --fa-secondary-opacity: .5;
    transition:all .4s;
}
.back_to_top_button:hover i{
    --fa-primary-color: var(--primaryTextColor);
    --fa-secondary-opacity: .2;
}
.back_to_top_button.dn{
    display:none;
}
@media screen and (max-width:800px){
    .back_to_top_button{
        right:20px;
    }
}