.scroll-to-top-button{position:fixed;bottom:20px;right:20px;background-color:var(--primary);color:#fff;border:none;border-radius:50%;width:50px;height:50px;font-size:16px;cursor:pointer;display:none;transition:all .3s ease;box-shadow:0 2px 10px rgba(0,0,0,.2);z-index:1000}.scroll-to-top-button:hover{background-color:var(--secondary);transform:scale(1.1)}.scroll-to-top-button:focus{outline:none;box-shadow:0 0 0 3px rgba(0,123,255,.5)}@media (max-width:768px){.scroll-to-top-button{width:40px;height:40px;font-size:14px}}.icon{width:24px;height:24px;transition:transform .3s ease}.icon:hover{transform:scale(1.1)}