/* source: problem\problem6.htm style block 1 */
body {
            font-family: Arial, sans-serif;
            margin: 20px;
        }
        img {
            width: min(320px, 80vw);
            height: auto;
            display: block;
            margin: 0 auto 20px;
        }
        .opgave {
            margin: 20px 0;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            background-color: #f9f9f9;
        }
        .action-buttons {
            margin: 10px 0;
        }
        table {
            width: 80%;
            margin: 10px auto;
            border-collapse: collapse;
        }
        th, td {
            border: 1px solid #ddd;
            padding: 8px;
            text-align: center;
        }
        th {
            background-color: #f4f4f4;
        }
        .mellemregning {
            margin-top: 10px;
            padding: 10px;
            background-color: #eef;
            border-radius: 8px;
            display: none;
        }
        button {
            margin: 10px 5px;
            padding: 10px 15px;
            font-size: 16px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }
        button:hover {
            background-color: #45a049;
        }
        .formula-box {
            padding: 10px;
            margin: 10px 0;
            border: 1px solid #ccc;
            border-radius: 8px;
            background-color: #fefefe;
            font-family: 'Courier New', monospace;
        }