Hi, please help me with the documentaton page please

Tell us what’s happening:
Do you know how to separate the #navbar and the #man-doc? Thank you.

Your code so far

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HTML
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Piano</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./styles.css">
  </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>
                                                                <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="#Reference">Reference</a>
                        </li>

      </ul>
    </nav>
    <main id="main-doc">
      <section class="main-section" id="Introduction">
        <header>Introduction</header>
        <article><p></p>
        <ul>
              <li></li>      
              <li></li>

        </ul>
        </article>
        </section>
        <section class="main-section" id="What_you_should_already_know">
        <header>What you should already know</header>
        <article><p></p>
        <ul>
          <li></li>
          <li></li>
          <li></li>
        </ul>
        </article>
        </section>
        <section class="main-section" id="JavaScript_and_Java">
        <header>JavaScript and Java</header>
        <article><p></p></article>
        </section>
        <section class="main-section" id="Hello_world">
        <header>Hello world</header>
        <article><p></p>
        <code>function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");</code>
        </article>
        </section>
        <section class="main-section" id="Variables">
        <header>Variables</header>
        <article><p></p></article>
        </section>
        <section class="main-section" id="Declaring_variables">
        <header>Declaring variables</header>
<article>
  <p>
    <code></code>
  </p>
  <p>
        <code></code>
  </p>
<p>
      <code></code>
</p>
</article>
        </section>
        <section class="main-section" id="Variable_scope">
        <header>Variable scope</header>
<article>
  <p></p>
  <p>
    <code></code>
  </p>
  <p></p>
<code></code>
</article>
        </section>
        <section class="main-section" id="Global_variables">
        <header>Global variables</header>
        <article><p></p>
        
        </article>
        </section>
        <section class="main-section" id="Constants">
        <header>Constants</header>
        <article>
          <p><code></code></p>
<p></p>
<p></p>
<p></p>
<code></code>
<code></code>
        </article>
        </section>
        <section class="main-section" id="Data_types">
        <header>Data types
</header>
<article><p></p></article>
        
        </section>
        <section class="main-section" id="Reference">
        <header>Reference
</header>
<article><p></p></article>
        
        </section>
    </main>
  </body>
  </html>
CSS
#navbar a{
  display: block;
  padding:10px 30px;
  color:#4d4e53;
  text-decoration:none;
  cursor:pointer;
}
#navbar{
  position: fixed;
    min-width: 290px;
    top: 0px;
    left: 0px;
    width: 300px;
    height: 100%;
    border-right: solid;
    border-color: rgba(0, 22, 22, 0.4);

}
#main-doc header{
  text-align: left;
  margin:0;
}
header{
  display:block;
}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Challenge: Build a Technical Documentation Page

Link to the challenge:

Hi, @vuongtritung

can you copy, paste the user stories you cannot fulfill here, may I can help.