Hello there 👋🏼, internet users. Today, I'll show you a CSS trick I frequently forget about when creating scrollable dynamic height layouts. Recently, I was developing a basic layout similar to one below. It took me a while to remember this trick, but once I did, I had a sense of deja vu and finished the layout.

There are two way to achieve this:

Way 1: Using css positions:

If you look at the code above, you'll see what I mean. As you can see, there's a NAVBAR, a BREADCRUMB BAR, the MAIN SECTION, and a FOOTER all contained within a layout container with the height of height: 100vh. I wanted the sidebar and content-box in my main section to be scrollable.

I could set the height as a fixed value, something like height: 800px with overflow-y: scroll but then making the layout responsive will become a nightmare.

So, the question arises? 🤔. How can we apply the overflow-y: scroll attribute to a div with a height of 100 percent?

The solution 🧪 here is to use position: relative for the main section container and position: absolute for the sidebar and content bar, with overflow-y: scroll.

.main {
position: relative;
height: 100%;
}

.sidebar {
position: absolute; 
top: 0;
left: 0;
bottom: 0;  /*stretch from top to bottom w.r.t .main section*/
width: 10rem;
overflow-y: scroll;
}

.content {
position: absolute;
top: 0;
left: 10rem;
bottom: 0;
right: 0; /* stretch from top to bottom, and shift 10rem from left and stretch till right */
overflow-y: scroll;
}

There are many other ways, to achieve this. It's just a trick i often use. If you have any alternate way please comment (I'm all 👂). Congratulations 🎉 for reading this. Hope this might help you. Thank you.

After many of you suggested there's a neat way to do this avoiding css positions. I've added another solution using css grid.

Way 2: Using css grid