<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Your Page Title</title>
    <style>
        header h1 {
            text-align: center;
            font-size: 80px;
            background-color: #87CEEB; /* Light blue color */
            padding: 20px; /* Add padding for better visibility */
            color: white; /* Set font color to white */
        }

        .container-all {
            display: flex;
            align-items: stretch;
            justify-content: space-between;
            flex-wrap: wrap;
            margin: 0;
            padding: 0;
        }

        #sidebar {
            width: 100%;
            height: 150vh;
            background-color: #87CEEB; /* Light blue color */
            color: white;
        }

        .container-right {
            flex: 1;
            background-color: rgba(255, 255, 255, 0.7);
            color: #333;
            height: 150vh;
            background-image: url("https://scontent-tpe1-1.xx.fbcdn.net/v/t1.15752-9/403420786_3545890912343597_8508172770326678141_n.jpg?stp=dst-jpg_s2048x2048&_nc_cat=101&ccb=1-7&_nc_sid=8cd0a2&_nc_ohc=GVP6BAh5Gk8AX8fPqtz&_nc_ht=scontent-tpe1-1.xx&oh=03_AdREEV-v-ksCR2h_Jsfy1pWJXLIzv0xSpVd-sLkvDBUzLQ&oe=65A4E1D8");
            background-repeat: no-repeat;
            background-size: cover;
            background-position: center;
            padding: 20px;
            overflow-y: scroll;
        }

        .container-right a {
            color: #99b4ee; /* Light blue color */
            text-decoration: none;
        }

        .container-right a.selected {
            color: #4169E1; /* Royal blue color for selected item */
        }

        .container-right h2 {
            text-align: center;
            font-size: 40px;
            color: #ffffff; /* Light blue color */
        }

        .container-right p {
            text-align: center;
            font-size: 24px;
            color: #469fe7; /* Light blue color */
        }

        #sidebar ul li a {
            padding: 15px;
            font-size: 20px;
            display: block;
            text-decoration: none;
            color: white;
        }

        #sidebar ul li a:hover {
            color: #4169E1; /* Royal blue color on hover */
            background-color: #ffffff; /* Light blue background on hover */
        }

        #sidebar li details summary {
            padding: 15px;
            font-size: 20px;
        }

        details ul li a {
            display: block;
            padding: 5px 0;
            color: white;
            text-decoration: none;
            transition: all 0.3s;
            font-size: 18px;
        }

        details ul li a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            font-size: 20px;
        }

        .container-right::-webkit-scrollbar {
            width: 10px;
        }

        .container-right::-webkit-scrollbar-thumb {
            background-color: rgba(0, 0, 0, 0.2);
        }

        .container a:hover {
            color: #FF4500; /* Orange-red color on hover */
        }

        .container h2 {
            margin-bottom: 20px;
        }

        #sidebar ul li {
            margin-bottom: 10px;
        }

        #sublist a {
            font-size: 25px;
        }

        #sublist a:hover {
            background-color: #87CEEB;
            color: #4169E1;
        }

        footer {
            background-color: #87CEEB;
            color: #fff;
            padding: 20px;
            text-align: center;
        }

        footer p {
            margin: 5px 0;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        @media (max-width: 768px) {
            header h1 {
                font-size: 60px;
            }

            .container-all {
                flex-direction: column;
            }

            #sidebar {
                height: auto;
            }

            .container-right {
                flex: 1;
                height: auto;
                background-size: contain;
                padding: 10px;
            }

            .container-right h2 {
                font-size: 30px;
            }

            .container-right p {
                font-size: 18px;
            }

            .container a {
                font-size: 20px;
            }

            footer {
                padding: 10px;
            }
        }

        @media (min-width: 769px) {
            header h1 {
                font-size: 100px;
            }

            #sidebar {
                height: 100vh;
            }

            .container-right {
                height: 100vh;
                padding: 20px;
            }

            .container-right h2 {
                font-size: 50px;
            }

            .container-right p {
                font-size: 30px;
            }

            .container a {
                font-size: 30px;
            }

            footer {
                padding: 20px;
            }
        }
    </style>
</head>

}
<body>
    <header>
        <h1>Your Header Content</h1>
    </header>

    <div class="container-all">
        <div id="sidebar">
            <!-- Your sidebar content -->
            <ul>
                <li><a href="#">Sidebar Item 1</a></li>
                <li><a href="#">Sidebar Item 2</a></li>
                <li>
                    <details>
                        <summary>Details</summary>
                        <ul>
                            <li><a href="#">Subitem 1</a></li>
                            <li><a href="#">Subitem 2</a></li>
                        </ul>
                    </details>
                </li>
            </ul>
        </div>

        <div class="container-right">
            <!-- Your main content for the right container -->
            <h2>Main Content Heading</h2>
            <p>Main Content Paragraph</p>
        </div>
    </div>

    <footer>
        <p>Your Footer Content</p>
    </footer>
</body>

</html>
