.scroll-visible::-webkit-scrollbar{height:8px}[dir] .scroll-visible::-webkit-scrollbar-thumb{background-color:#ccc;border-radius:4px}[dir] .scroll-visible::-webkit-scrollbar-track{background-color:#f5f5f5}.scroll-down-btn{position:fixed;bottom:30px;z-index:1000}[dir] .scroll-down-btn{box-shadow:0 4px 12px rgba(0,0,0,.15)}[dir=ltr] .scroll-down-btn{right:50px}[dir=rtl] .scroll-down-btn{left:50px}[dir] .scroll-down-btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,.2)}.scroll-down-btn{transition:all .3s ease}