html {
        scroll-behavior: smooth;
    }

    .back-to-top {
        position: fixed;
        bottom: 20px;
        right: 20px;
        z-index: 99;
        width: 40px;
        height: 40px;
        background-color: #007bff;
        color: white;
        text-align: center;
        line-height: 40px;
        border-radius: 50%;
        cursor: pointer;
    }

    .back-to-top:hover {
        background-color: #0056b3;