How to Fix TailwindCSS z-index Problem with `isolate`

I was building a website with a sticky navbar that had a z-index of z-10. Later, I added a div with some text in the main content section.

When I scrolled up, I realized that the text appeared above the navbar, even though I had increased the navbar’s z-index and reduced the z-index of the content.

I even tried using the !important flag (e.g., !z-) on the z-index, which worked sometimes, but it felt messy and unreliable.

Before using the isolate, here is how the text goes over the navbar.

The Solution

I followed these steps to fix the issue:

1. Locate the Parent Container: I identified the main parent div that holds all the content below the navbar.

2. Add the isolate Class: I added the isolate class to this parent div.

   This class ensures that the z-index of its children doesn’t interfere with elements outside this container, like the navbar.

3. Tested the Fix: After applying the isolate class, I noticed that the text no longer appeared above the navbar, even when its z-index was set higher.

   The isolate class scoped the z-index properly, ensuring no overlap.

Example Implementation in Next.js

Here’s the exact code I used:

export default function Home() {
  return (
    <div>
      {/* Sticky Navbar */}
      <header className="sticky top-0 z-10 bg-blue-500 p-4 text-white">
        Sticky Navbar
      </header>

      {/* Main Content */}
      <main className="relative isolate p-4">
        <div className="relative z-20 bg-gray-100 p-8">
          <h1 className="text-2xl font-bold">Main Content</h1>
          <p>
            This content has a higher z-index but won’t overlap the navbar
            because the `isolate` class is applied to the parent container.
          </p>
        </div>
      </main>
    </div>
  );
}

After using the isolate, here is how the text goes below the navbar.

Why It Works

By adding the isolate class to the parent container (<main>), the z-index values of its children (<div> with z-20) become relative to other elements within that container.

This prevents them from interfering with elements outside, like the sticky navbar.

More For You ☄

Who Owns ChatGPT and Who Created It? All You Need to Know

How to Download Images from URL in Node.js?

How to Fix PDFDrive not Working or Downloading?

Difference Between JavaScript Object and JSON

How to Install Node.js in Windows?