Flex-direction:column not working in my case

Tell us what’s happening:
Hi Team,

I am working on the Technical documentation front end project and trying to make it responsive…I am a beginner…so please bear with me.

So my entire page is called the main-container and it has two child containers: child-1 and child-2. child-1 has Navbar elements and child-2 has body content. I converted the parent container to flex so that both the children are beside each other. For the mobile view, I wanted them to be on top of each other and therefore I tried flex-direction: column, but the media query is not working…it would be great if someone can advise me where the issue is…

my codepen link: https://codepen.io/Agastya_Teja/pen/VwLJQJX

Your code so far

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="css/style.css">
    <link rel="stylesheet" media="screen and (max-width:768px)" href="css/mobile.css">
    <link rel="stylesheet" media="screen and (min-width: 1100px)" href="css/widescreen.css">
    <title>JavaScript Documentation</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --dark-color: #333;
            --light-color: #f4f4f4;
            --gold-color: #f7c08a;
        }

        h1,
        h2,
        h3 {
            margin: 1.5rem 0;
        }

        p {
            margin: 1rem;

        }

        a {
            text-decoration: none;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.25;
        }

        /* Main-container */
        .main-container {
            display: flex;
            flex-direction: column;
            overflow: hidden;

        }

        /* Child-containers */
        .child-1 {
            border-right: 1px solid var(--dark-color);
        }

        .child-2 {
            padding-left: 1rem;
            width: 1000px;
        }

        /* Nav-bar */

        #navbar {
            background: var(--dark-color);
            position: fixed;
            left: 0;
            top: 0;
            width: 15rem;
        }

        #navbar ul {

            height: 100vh;
            /* overflow-y: auto;
    overflow-x: hidden; */
            overflow: scroll;
        }

        #navbar h1 {
            font-size: 1.25rem;
            margin: 1rem;
            color: var(--light-color);
        }

        #navbar li {
            padding: 1rem 1rem;
            border-bottom: 1px solid var(--dark-color);
        }

        #navbar li a {
            color: var(--light-color);
            cursor: pointer;
        }

        #navbar li a:hover {
            color: var(--gold-color);
        }

        /* Child-2 */

        .child-2 li {
            margin-left: 4rem;
            padding: 0.5rem;
        }

        .child-2 code {
            margin-left: 4rem;
            padding: 0.5rem;
        }

        .child-2 {
            margin-left: 20rem;
        }

        @media(max-width:768px) {
            .main-container {
                flex-direction: column;
            }
        }
    </style>
</head>

<body>
    <div class="main-container">

        <div class="child-1">
            <nav id="navbar">
                <header>
                    <h1>JavaScript Documentation</h1>
                </header>
                <ul>
                    <li><a class="nav-link" href="#Introduction">Introduction</a></li>
                    <li><a class="nav-link" href="#What_you_should_already_know">What you should already know</a></li>
                    <li><a class="nav-link" href="#JavaScript_and_Java">JavaScript and Java</a></li>
                    <li><a class="nav-link" href="#Hello_World">Hello world</a></li>
                    <li><a class="nav-link">Variables</a></li>
                    <li>
                        <a class="nav-link" href="#Declaring_variables">Declaring variables</a>
                    </li>
                    <li><a class="nav-link" href="#Variable_scope">Variable scope</a></li>
                    <li><a class="nav-link" href="#Global_variables">Global variables</a></li>
                    <li><a class="nav-link" href="#Constants">Constants</a></li>
                    <li><a class="nav-link" href="#Data_types">Data types</a></li>
                    <li>
                        <a class="nav-link" href="#if...else_statement">if...else statement</a>
                    </li>
                    <li><a class="nav-link" href="#while_statement">while statement</a></li>
                    <li>
                        <a class="nav-link" href="#Function_declarations">Function declarations</a>
                    </li>
                    <li><a class="nav-link" href="#Reference">Reference</a></li>
                </ul>
            </nav>
        </div>
        <div class="child-2">
            <main id="main-doc">
                <section class="main-section" id="Introduction">
                    <!-- 1 -->
                    <header>
                        <h1>Introduction</h1>
                    </header>
                    <p>JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight
                        language. Inside a host environment (for example, a web browser), JavaScript can be connected to
                        the objects of its environment to provide programmatic control over them.</p>
                    <p>JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set
                        of language elements such as operators, control structures, and statements. Core JavaScript can
                        be extended for a variety of purposes by supplementing it with additional objects; for example:
                    </p>
                    <ul>
                        <li>Client-side JavaScript extends the core language by supplying objects to control a browser
                            and its Document Object Model (DOM). For example, client-side extensions allow an
                            application to place elements on an HTML form and respond to user events such as mouse
                            clicks, form input, and page navigation.</li>
                        <li>Server-side JavaScript extends the core language by supplying objects relevant to running
                            JavaScript on a server. For example, server-side extensions allow an application to
                            communicate with a database, provide continuity of information from one invocation to
                            another of the application, or perform file manipulations on a server.</li>
                    </ul>
                </section>
                <section class="main-section" id="What_you_should_already_know">
                    <!-- 2 -->
                    <header>
                        <h1>What you should already know</h1>
                    </header>
                    <p>This guide assumes you have the following basic background:</p>
                    <ul>
                        <li>A general understanding of the Internet and the World Wide Web (WWW).</li>
                        <li>Good working knowledge of HyperText Markup Language (HTML).</li>
                        <li>Some programming experience. If you are new to programming, try one of the tutorials linked
                            on the main page about JavaScript.</li>
                    </ul>
                </section>
                <section class="main-section" id="JavaScript_and_Java">
                    <!-- 3 -->
                    <header>
                        <h1>JavaScript and Java</h1>
                    </header>
                    <p>JavaScript and Java are similar in some ways but fundamentally different in some others. The
                        JavaScript language resembles Java but does not have Java's static typing and strong type
                        checking. JavaScript follows most Java expression syntax, naming conventions and basic
                        control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.
                    </p>
                    <p>In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a
                        runtime system based on a small number of data types representing numeric, Boolean, and string
                        values. JavaScript has a prototype-based object model instead of the more common class-based
                        object model. The prototype-based model provides dynamic inheritance; that is, what is inherited
                        can vary for individual objects. JavaScript also supports functions without any special
                        declarative requirements. Functions can be properties of objects, executing as loosely typed
                        methods.</p>
                    <p>JavaScript is a very free-form language compared to Java. You do not have to declare all
                        variables, classes, and methods. You do not have to be concerned with whether methods are
                        public, private, or protected, and you do not have to implement interfaces. Variables,
                        parameters, and function return types are not explicitly typed.</p>
                </section>
                <section class="main-section" id="Hello_World">
                    <!-- 4 -->
                    <header>Hello world</header>
                    <p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world"
                        JavaScript code:</p>
                    <code>
                        <pre>
                            function greetMe(yourName) { alert("Hello " + yourName); }
                            greetMe("World");
                        </pre>                      
                    </code>
                    <p>Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!</p>
                </section>
                <section class="main-section" id="Declaring_variables">
                    <!-- 5 -->
                    <header>Declaring_variables</header>
                    <p>You use variables as symbolic names for values in your application. The names of variables,
                        called identifiers, conform to certain rules.</p>
                    <p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent
                        characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the
                        characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p>
                    <p>You can use ISO 8859-1 or Unicode letters such as å and ü in identifiers. You can also use the
                        Unicode escape sequences as characters in identifiers. Some examples of legal names are
                        Number_hits, temp99, and _name.</p>
                </section>
                <section class="main-section" id="Variable_scope">
                    <!-- 6 -->
                    <header>Variable scope</header>
                    <p>You can declare a variable in three ways:</p>
                    <p>With the keyword var. For example,</p>
                    <code>
                        <pre>
                            var x = 42.
                        </pre>
                    </code>
                    <p>This syntax can be used to declare both local and global variables.</p>
                    <p>By simply assigning it a value. For example,</p>
                    <code>
                        <pre>
                            x = 42.
                        </pre>
                    </code>
                    <p>This always declares a global variable. It generates a strict JavaScript warning. You shouldn't
                        use this variant.</p>
                    <p>With the keyword let. For example,</p>
                    <code>
                        <pre>
                            let y = 13.
                        </pre>
                    </code>
                    <p>This syntax can be used to declare a block scope local variable. See Variable scope below.</p>

                </section>
                <section class="main-section" id="Global_variables">
                    <!-- 7 -->
                    <header>Global variables</header>
                    <p>When you declare a variable outside of any function, it is called a global variable, because it
                        is available to any other code in the current document. When you declare a variable within a
                        function, it is called a local variable, because it is available only within that function.</p>
                    <p>JavaScript before ECMAScript 2015 does not have block statement scope; rather, a variable
                        declared within a block is local to the function (or global scope) that the block resides
                        within. For example the following code will log 5, because the scope of x is the function (or
                        global context) within which x is declared, not the block, which in this case is an if
                        statement.</p>
                    <code>
                        <pre>
                            if (true) { var x = 5; } console.log(x); // 5
                        </pre>
                    </code>
                    <p>This behavior changes, when using the let declaration introduced in ECMAScript 2015.</p>
                    <code>
                        <pre>
                            if (true) { let y = 5; } console.log(y); // ReferenceError: y is notdefined
                        </pre>
                    </code>
                </section>
                <section class="main-section" id="Constants">
                    <!-- 8 -->
                    <header>Constants</header>
                    <p>Global variables are in fact properties of the global object. In web pages the global object is
                        window, so you can set and access global variables using the window.variable syntax.</p>
                    <p>Consequently, you can access global variables declared in one window or frame from another window
                        or frame by specifying the window or frame name. For example, if a variable called phoneNumber
                        is declared in a document, you can refer to this variable from an iframe as parent.phoneNumber.
                    </p>
                </section>
                <section class="main-section" id="Data_types">
                    <!-- 9 -->
                    <header>Data types</header>
                    <p>You can create a read-only, named constant with the const keyword. The syntax of a constant
                        identifier is the same as for a variable identifier: it must start with a letter, underscore or
                        dollar sign and can contain alphabetic, numeric, or underscore characters.</p>
                    <code>
                        <pre>
                            const PI = 3.14;
                        </pre>
                    </code>
                    <p>A constant cannot change value through assignment or be re-declared while the script is running.
                        It has to be initialized to a value.</p>
                    <p>The scope rules for constants are the same as those for let block scope variables. If the const
                        keyword is omitted, the identifier is assumed to represent a variable.</p>
                    <p>You cannot declare a constant with the same name as a function or variable in the same scope. For
                        example:</p>
                </section>
                <section class="main-section" id="if_else_statement">
                    <!-- 10 -->
                    <header>if else statement</header>
                    <p>The latest ECMAScript standard defines seven data types:</p>
                    <ul>
                        <li>Six data types that are primitives:
                            <ul>
                                <li>Boolean. true and false.</li>
                                <li>null. A special keyword denoting a null value. Because JavaScript is case-sensitive,
                                    null is not the same as Null, NULL, or any other variant.</li>
                                <li>undefined. A top-level property whose value is undefined.</li>
                                <li>Number. 42 or 3.14159.</li>
                                <li>String. "Howdy"</li>
                                <li>Symbol (new in ECMAScript 2015). A data type whose instances are unique and
                                    immutable.</li>
                            </ul>
                        </li>
                        <li>and Object</li>
                    </ul>
                </section>
            </main>
        </div>
    </div>
</body>

</html>

Your browser information:

User Agent is: Chrome/80.0.3987.132 Safari/537.36.

Challenge: Technical Documentation

Link to the challenge:
https://codepen.io/freeCodeCamp/full/NdrKKL

You need to override the position of #navbar in media query. The fixed position removes the element from the normal document flow, thus only child 2 is placed in a column.

Hi thank you for the advice… i tried what overriding navbar position but it didn’t work out …

Set the position of #navbar in media query to static or relative. When you set it they appear in a column, but not one above each other visually, since you have a margin-left on your .child-2, so you need to change that in media query as well. Every property will stay as you set it, unless you specifically change it in media query.

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Thank you very much… I was able to fix this issue. I just revisited this problem today after 9 days. I was able to fix it in a few minutes

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