Creating a Fullscreen div Element with CSS
Tags: css, webdev, javascript, beginners
Published: 2023-07-12 15:11:42

## Summary 

```css
#fullscreen-div {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #000; /* Set the background color to your preference */
  z-index: 9999; /* Adjust the z-index as needed */
}
```
- You can also create full screen video element like youtube embed links...


---

**Creating a Fullscreen `div` Element with CSS**

When building a website or web application, there may be times when you want to display a `div` element that covers the entire window. This fullscreen `div` can be useful for embedding videos, creating overlays, or designing immersive experiences. In this article, we'll explore how to achieve this effect using CSS.

To begin, let's start with a basic HTML structure. Open your preferred code editor and create a new HTML file. Inside the `body` element, add the following code:

```html
<!DOCTYPE html>
<html>
<head>
  <title>Fullscreen div Example</title>
  <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
  <div id="fullscreen-div"></div>

  <!-- Your content goes here -->
  <h1>Welcome to my website</h1>
  <p>This is some example content.</p>

  <script src="script.js"></script>
</body>
</html>
```

In the code snippet above, we have a simple HTML structure with a `div` element that has an `id` of "fullscreen-div". This is the element we'll be working with to make it fit the entire window. Feel free to replace the "Your content goes here" section with your own content.

Next, let's move on to the CSS. Create a new file in your code editor and save it as `styles.css`. In this file, we'll define the styles for our fullscreen `div` element:

```css
#fullscreen-div {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #000; /* Set the background color to your preference */
  z-index: 9999; /* Adjust the z-index as needed */
}
```

In the CSS code snippet above, we select the `div` element with the `id` of "fullscreen-div" and apply the following styles:

- `position: fixed` ensures that the `div` remains fixed in place, even if the user scrolls the page.
- `top: 0` and `left: 0` position the `div` element at the top left corner of the viewport.
- `width: 100vw` and `height: 100vh` set the width and height of the `div` to occupy the entire viewport.
- `background-color` can be customized to your preferred color. The example uses "#000" for black.
- `z-index: 9999` sets the stacking order of the `div` element. Adjust this value if you want the `div` to appear above or below other elements on the page.

Save the `styles.css` file and return to your HTML file. Link the CSS file by adding the following line within the `head` section:

```html
<link rel="stylesheet" type="text/css" href="styles.css">
```

Finally, open your HTML file in a web browser, and you'll see the `div` element covering the entire window. Any content you add below the `div` will appear behind it, giving the effect of a fullscreen overlay.

You can now utilize this fullscreen `div` element to embed videos, create overlays, or apply any custom design you desire. Experiment with different styles, such as gradients, images, or opacity, to achieve the desired visual effect.

In conclusion, creating a fullscreen `div` element using CSS is a straightforward process. By setting the appropriate CSS properties, such as position, width, height, and background color, you can easily make a `div` fit the entire window and enhance the visual experience of your website or web application.