body {
            font-family: Arial, sans-serif;
            background: #f1f3f4;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .container {
            background: #fff;
            padding: 20px 30px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            text-align: center;
            width: 400px;
        }

        h2 {
            margin-bottom: 15px;
            color: #333;
        }

        input[type="file"] {
            margin: 10px 0;
        }

        img {
            display: none;
            width: 100%;
            max-height: 200px;
            object-fit: contain;
            margin-top: 10px;
            border-radius: 6px;
            border: 1px solid #ddd;
        }

        input[type="range"] {
            width: 100%;
        }

        button {
            background: #1a73e8;
            color: #fff;
            border: none;
            padding: 10px 18px;
            border-radius: 5px;
            cursor: pointer;
            margin-top: 10px;
            font-size: 14px;
            transition: 0.2s;
        }

        button:hover {
            background: #155fc0;
        }

        #sizeInfo {
            font-size: 14px;
            color: #555;
            margin-top: 10px;
        }