What causes the CSS Position Fixed Property to fail?

Can someone help me fix my navbar so that it remains fixed when I scroll? Currently, it moves up as I scroll down. Below are the source codes I'm using:

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
h1 {
  margin: 1rem;
}

ul {
  position: fixed;
  width: 100vw;
  padding-top: 5px;
  list-style-type: none;
  background-color: #333333;
  height: 40px;
}

li {
  display: block;
  float: left;
  font-size: 1.25rem;
}

a {
  text-decoration: none;
  color: white;
  padding: 12px;
}

a:hover:not(.home) {
  background-color: #111111;
}

.home {
  background-color: #04aa6d;
}

main {
  position: absolute;
  top: 40px;
  background-color: #1abc9c;
  width: 100vw;
}
<body>
    <header>
      <ul>
        <li><a class="home" href="">Home</a></li>
        <li><a href="">News</a></li>
        <li><a href="">Contact</a></li>
        <li><a href="">About</a></li>
      </ul>
    </header>
    <main>
      <h1>Fixed Top Navigation Bar</h1>
      <p>Abdul Alim loves to cultivate crops and travel. Wanna hear a story?</p>
      <p>Abdul Alim loves to cultivate crops and travel. Wanna hear...;

I need help fixing the header/navbar content to remain fixed while scrolling. I'm new to HTML/CSS, so detailed explanations would be greatly appreciated. Thanks, Abdul Alim

htmlcsspositioncss-position

Answer №1

your code is technically correct, but the issue lies in the fact that the navbar is positioned behind another element, causing it to be covered up

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
h1 {
  margin: 1rem;
}

ul {
  position: fixed;
  width: 100vw;
  padding-top: 5px;
  list-style-type: none;
  background-color: #333333;
  height: 40px;
  z-index: 99; /* you can add z-index dinavbar */
}

li {
  display: block;
  float: left;
  font-size: 1.25rem;
}

a {
  text-decoration: none;
  color: white;
  padding: 12px;
}

a:hover:not(.home) {
  background-color: #111111;
}

.home {
  background-color: #04aa6d;
}

main {
  position: absolute;
  top: 40px;
  background-color: #1abc9c;
  width: 100vw;
}
<body>
    <header>
      <ul>
        <li><a class="home" href="">Home</a></li>
        <li><a href="">News</a></li>
        <li><a href="">Contact</a></li>
        <li><a href="">About</a></li>
      </ul>
    </header>
    <main>
      <h1>Fixed Top Navigation Bar</h1>
      <p>Abdul Alim loves to cultivate crops and travel. Wanna hear a story?</p>
      <!-- repeated paragraph for demonstration purposes -->
      <!-- more paragraphs... -->
      <p>Abdul Alim loves to cultivate crops and travel. Wanna hear a story?</p>
    </main>
  </body>

Answer №2

Make sure to set the z-index property for the < ul > element in your code. Since your header is fixed at the top, it may be hidden behind the < main > section when you scroll down. To avoid this issue, simply add a high z-index value to the < ul >.

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
h1 {
  margin: 1rem;
}

ul {
  position: fixed;
  width: 100vw;
  padding-top: 5px;
  list-style-type: none;
  background-color: #333333;
  height: 40px;
  z-index: 99;
}

li {
  display: block;
  float: left;
  font-size: 1.25rem;
}

a {
  text-decoration: none;
  color: white;
  padding: 12px;
}

a:hover:not(.home) {
  background-color: #111111;
}

.home {
  background-color: #04aa6d;
}

main {
  position: absolute;
  top: 40px;
  background-color: #1abc9c;
  width: 100vw;
}
  <body>
    <header>
      <ul>
        <li><a class="home" href="">Home</a></li>
        <li><a href="">News</a></li>
        <li><a href="">Contact</a></li>
        <li><a href="">About</a></li>
      </ul>
    </header>
    <main>
      <h1>Fixed Top Navigation Bar</h1>
      <p>Abdul Alim loves to cultivate crops and travel. Wanna hear a story?</p>
      <p>Abdul Alim loves to cultivate crops and travel. Wanna hear a story?</p>
      [...]
      <p>Abdul Alim loves to cultivate crops and travel. Wanna hear a story?</p>
    </main>
  </body>

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