Technical Documentation Page - Build a Technical Documentation Page

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Cant pass the last step:" Your Technical Documentation project should use at least one media query."

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <link rel="stylesheet" href="/.style.css">
  <title>Technical doc</title>
  </head>
<body>
  <nav id="navbar">
<header>JS Documentation</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" href="#Variables">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>
    </ul>
    </nav>
  <main id="main-doc">
    <section class="main-section" id="Introduction">
    <header>Introduction</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">
      <header>What you should already know</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">
      <header>JavaScript and Java</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">
      <header>Hello world</header>
      <article>
        
          To get started with writing JavaScript, open the Scratchpad and write
          your first "Hello world" JavaScript code:
          <code>
            function greetMe(yourName) { alert("Hello " + yourName); }
            greetMe("World");
          
            </code>
            

          Select the code in the pad and hit Ctrl+R to watch it unfold in your
          browser!
        </article>
      </section>
      <section class="main-section" id="Variables">
      <header>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="Declaring_variables">
  <header>Declaring variables</header>
<p>
          You can declare a variable in three ways:
          </p>
      <p>
        
            With the keyword var. For example, 
            <code>var x = 42.</code>
             This
            syntax can be used to declare both local and global variables.
          
        </p>
      <p>
        
            With the keyword let. For example,
            <code> let y = 13.</code>
             This
            syntax can be used to declare a block scope local variable. See
            Variable scope below.
          
        </p>
  </section>
  <section class="main-section" id="Variable_scope">
    <header>Variable scope</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>if (true) { var x = 5; } console.log(x); // 5</code>
    <p>
      
            This behavior changes, when using the let declaration introduced in
            ECMAScript 2015.
          
          </p>
          <code>if (true) { let y = 5; } console.log(y); // ReferenceError: y is
            not defined</code>
    </section>
      </main>
  </body>
  </html>

CSS
@media only screen and (max-width: 815px) {
  /* For mobile phones: */
  #navbar ul {
    border: 1px solid;
    height: 207px;
  }

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36 OPR/90.0.4480.100

Challenge: Technical Documentation Page - Build a Technical Documentation Page

Link to the challenge:

Make sure you use the correct file name for the CSS.

<link rel="stylesheet" href="styles.css">

Also, in the code you posted the media query isn’t closed }

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