body {
            font-family: 'Arial', sans-serif;
            background-color: #f2f2f2;
            margin: 0;
            padding: 0;
        }

        header {
            background-color: maroon;
            color: #fff;
            padding: 10px;
            text-align: center;
        }

        main {
            max-width: 800px;
            margin: 20px auto;
            padding: 20px;
            background-color: #fff;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }

        h2 {
            color: #333;
        }

        .problem {
            margin-bottom: 20px;
        }

        .solution {
            color: #007bff;
            cursor: pointer;
        }
        
        
        
        
        
        /*MENU BAR*/
           nav {
            background-color: maroon;
            overflow: hidden;
        }

        nav a {
            float: left;
            display: block;
            color: #fff;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
        }

        nav a:hover {
            background-color: #0056b3;
            color: #fff;
        }

        .dropdown {
            float: left;
            overflow: hidden;
        }

        .dropdown .dropbtn {
            font-size: 16px;
            border: none;
            outline: none;
            color: #fff;
            padding: 14px 16px;
            background-color: inherit;
            font-family: inherit;
            margin: 0;
        }

        nav a, .dropdown:hover .dropbtn {
            background-color: #007bff;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            background-color: #007bff;
            min-width: 160px;
            box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2);
            z-index: 1;
        }

        .dropdown-content a {
            float: none;
            color: #fff;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
            text-align: left;
        }

        .dropdown-content a:hover {
            background-color: #0056b3;
            color: #fff;
        }

        @media screen and (max-width: 600px) {
            nav a, .dropdown .dropbtn {
                display: none;
            }

            .dropdown-content a {
                display: block;
                width: 100%;
                text-align: left;
            }

            .dropdown {
                display: block;
                width: 100%;
            }
        }
        
        /*END MENU BAR*/