Untitled

        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            line-height: 1.6;
        }
        pre {
            background-color: #f5f5f5;
            padding: 10px;
            border-radius: 5px;
            overflow-x: auto;
        }
        h1, h2 {
            color: #2c3e50;
        }
        .formula {
            background-color: #f8f9fa;
            padding: 10px;
            border-left: 4px solid #3498db;
            margin: 20px 0;
        }
        button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
        }
        button:hover {
            background-color: #2980b9;
        }
        #output {
            margin-top: 20px;
        }