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CSS sticky positioning optimization guide on nested elements in a Flexbox layout

👀 Views: 72 💬 Answers: 1 📅 Created: 2025-06-04
css flexbox sticky HTML/CSS

I've been working on this all day and I'm integrating two systems and I'm writing unit tests and After trying multiple solutions online, I still can't figure this out... I'm trying to implement a sticky position on a sidebar within a Flexbox layout, but it's not behaving as expected. The sidebar is supposed to stick to the top of the viewport when I scroll down, but it just scrolls with the rest of the content instead. Here’s the structure of my HTML: ```html <div class="container"> <div class="sidebar">Sidebar</div> <div class="content">Main content goes here...</div> </div> ``` And here’s the CSS I’m using: ```css .container { display: flex; height: 100vh; } .sidebar { width: 200px; position: sticky; top: 0; background: #f4f4f4; height: 100%; } .content { flex: 1; padding: 20px; } ``` I’ve checked that my `position: sticky;` is set correctly, but the sidebar scrolls away with the content. I’m using Chrome version 95.0.4638.54, and I don’t see any errors in the console. I’ve also tried adjusting the `top` property and wrapping the sidebar in another div to control overflow, but nothing seems to work. Has anyone encountered similar issues with sticky positioning in a Flexbox layout, or can someone suggest what might be going wrong here? I'm working with Html/Css in a Docker container on Ubuntu 20.04. What would be the recommended way to handle this? I'm using Html/Css LTS in this project. Thanks, I really appreciate it! Any ideas how to fix this?