title: Why is there space between the document and my navigator?
body: <p>The padding and margin of the body and my navigator has been set to 0, yet there is still space between the top part of my navigator. How do I fix this?</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
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  <pre class="snippet-code-css lang-css prettyprint-override"><code>body {
    margin: 0;
    padding: 0;
  }
  
  #header_container {
    margin: 0;
    padding: 0;
    background-color: rgb(0, 0, 119);
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="header_container"&gt;
    &lt;ul&gt;
      &lt;li id="homepage_name"&gt;name&lt;/li&gt;
      &lt;div id="buttons"&gt;
        &lt;li id="home"&gt;Home&lt;/a&gt;
        &lt;/li&gt;
        &lt;li id="about_us"&gt;About us&lt;/a&gt;
        &lt;/li&gt;
        &lt;li id="contacts"&gt;Contacts&lt;/li&gt;
      &lt;/div&gt;
    &lt;/ul&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>