body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f4f7f6;
        }

        h1 {
            text-align: center;
            color: #2c3e50;
            border-bottom: 3px solid #3498db;
            padding-bottom: 10px;
            margin-bottom: 30px;
        }

        /* Accordion Button Styles */
        .accordion-btn {
            background-color: #3498db;
            color: white;
            cursor: pointer;
            padding: 18px;
            width: 100%;
            text-align: left;
            border: none;
            outline: none;
            transition: background-color 0.3s ease;
            font-size: 20px;
            font-weight: bold;
            border-radius: 8px;
            margin-top: 15px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .active,
        .accordion-btn:hover {
            background-color: #2980b9;
        }

        /* Add a plus/minus icon indicator */
        .accordion-btn:after {
            content: '\002B';
            /* Unicode for plus sign */
            font-size: 24px;
            color: white;
            float: right;
            margin-left: 5px;
        }

        .active:after {
            content: "\2212";
            /* Unicode for minus sign */
        }

        /* Accordion Content Styles */
        .accordion-content {
            padding: 0 20px;
            background-color: white;
            display: none;
            /* Hidden by default */
            overflow: hidden;
            border-radius: 0 0 8px 8px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            margin-bottom: 10px;
        }

        ul {
            list-style-type: none;
            padding: 10px 0;
        }

        li {
            background: #ecf0f1;
            margin: 10px 0;
            padding: 15px;
            border-left: 5px solid #e74c3c;
            border-radius: 4px;
        }

        .timeline-date {
            font-weight: bold;
            color: #c0392b;
            font-size: 1.1em;
        }

        .intro-text {
            text-align: center;
            font-size: 1.2em;
            margin-bottom: 30px;
            color: #555;
        }