gototop

* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: Arial, sans-serif;
            padding: 20px;
            min-height: 200vh;
        }

        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: #333;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
            transition: background 0.3s;
        }

        .scroll-top:hover {
            background: #555;
        }

        .scroll-top::before {
            content: '↑';
            color: white;
            font-size: 28px;
            font-weight: bold;
        }

        @media (max-width: 768px) {
            .scroll-top {
                width: 45px;
                height: 45px;
                bottom: 20px;
                right: 20px;
            }
        }