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Learn how to fix a parent div at the top of the page without affecting its child div's scrolling behavior. Follow this guide for a simple solution using CSS and JavaScript.
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This video is based on the question https://stackoverflow.com/q/68741437/ asked by the user 'DESH' ( https://stackoverflow.com/u/8950066/ ) and on the answer https://stackoverflow.com/a/68742018/ provided by the user 'amirify' ( https://stackoverflow.com/u/8488702/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix a Parent Div to the Top While Keeping Child Divs Scrollable

When designing web pages, one common requirement is to keep a header or parent div fixed at the top of the screen while allowing the content of the child div to scroll beneath it. This can be particularly useful for navigation menus or informational headers that should remain visible as users browse through lengthy content. However, achieving this effect can be tricky due to the way CSS handles positioning. In this guide, we'll explore a simple solution using a combination of CSS and JavaScript.

Problem Overview

You have a parent div that you want to fix to the top of the page, but you don't want this fixed positioning to apply to its child divs. As users scroll down, you want the child content to move beneath the parent div, allowing for a seamless user experience. The challenge lies in correctly applying the styles without the use of additional elements or a complex layout.

The Initial Code

Here is the initial HTML and CSS setup that we’re working with:

[[See Video to Reveal this Text or Code Snippet]]

[[See Video to Reveal this Text or Code Snippet]]

In this code, the parent div is fixed at the top, but the children are subject to this fixed positioning, which stands in the way of the desired effect.

The Solution

Step 1: Update your CSS

First, you'll need to make adjustments to your existing CSS to ensure the children div will not be affected by the parent. Here’s the modified CSS:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Implement JavaScript for Scroll Behavior

Now that the CSS is in place, you’ll want to add some JavaScript to ensure that when you scroll, the children can adjust their position relative to the fixed parent. Here’s the essential script:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Complete Example

Here's how all the pieces come together in the final code structure:

[[See Video to Reveal this Text or Code Snippet]]

Full CSS and JavaScript

Make sure to include the CSS and JavaScript snippets provided above in your project. This will create the desired effect of having the parent div fixed at the top while the children scroll underneath it.

Conclusion

Achieving a fixed positioning effect for a parent div while allowing its children to scroll underneath is easily accomplished with a careful combination of CSS and JavaScript. By updating your CSS to create a relative positioning context for the children and implementing a simple JavaScript scroll event listener, you can create a seamless user experience that keeps important content visible at all times.

Now you're ready to implement this technique in your own projects! Happy coding!