#backToTopBtn{padding:10px 20px;display:none;background-color:var(--color-primary);color:#fff;border:none;border-radius:30px;cursor:pointer;box-shadow:4px 4px 10px rgba(0,0,0,.2);transition:all .3s;position:fixed;bottom:60px;right:20px;z-index:1000;opacity:.6}#backToTopBtn.visible{display:block}#backToTopBtn:hover{opacity:1;box-shadow:2px 2px 5px rgba(0,0,0,.3);transform:scale(1.05)}.category-official{background-color:#fff9db}.hidden{display:none!important}