How to display a fixed navbar in Nextjs?

Question

I have a Nextjs app that displays the same navbar on each page. The navbar has a fixed position. The display is correct on the homepage (written in index.tsx). But when I click on a new page, the new page is hidden behind the navbar!

The issue disappears if I remove the fixed position property. But I can't believe Nextjs doesn't support such a basic task.

The code is very simple:

// _app.tsx

function MyApp({ Component, pageProps }: AppProps) {
  return (
    <>
        <Navbar />
        <Component {...pageProps} />
    </>
  );
}

export default MyApp;


// about.tsx

const About: NextPage = () => {
  return (
    <section>
      <h1>About</h1>
    </section>
  );
};

export default About 

// navbar.tsx
export default function Navbar() {
  const router = useRouter();
  return (
<nav className={styles.navbar}>
  <Link href="/">
    <Image
      src={icon.src}
      className={styles.logo}
      alt="logo"
      width={70}
      height={70}
    />
  </Link>
  <ul className={styles.list}>
    <li
      className={
        router.route === "/about" ? styles.listItemActive : styles.listItem
      }
    >
      <Link href="/about">About</Link>
    </li>
  </ul>
</nav>
  );
}

//navbar.module.css
.navbar {
  background-color: var(--dark);
  color: #fff;
  height: 80px;
  width: 100vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  position: fixed;
  z-index: 999;
}

.logo {
  cursor: pointer;
}

.list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
}

.listItem {
  cursor: pointer;
}

.listItemActive {
  cursor: pointer;
  color: var(--red);
}

How to fix this?

Answer 1

If what you want is to have a sticky navbar, you can do it with pure CSS with position: sticky like this:

header, nav, main {
  padding: 1.7rem 1rem;
}

header {
  background-color: #d99;
}

nav {
  position: sticky;
  top: 2rem;
  background-color: #9d9;
}

main {
  height: 100vh;
  background-color: #99d;
}

--

<header>
    Header
</header>

<nav>
    Navbar
</nav>

<main>
    Main
</main>

Answer 2

As mentioned in the previous answer. inplace does not guarantee it won't be copied. You can inspect the unique id of each object to proof it out.

import pandas as pd

df = pd.DataFrame({
    "x": [1, 2, 3],
    "y": [4, 5, 6]
})

x = df

print(f'Original: {id(df)}')
print(f'View:     {id(x)}')
print(f'Copy:     {id(df.drop(index=[0], inplace=True))}')

Out[1]
Original: 2570551559120
View:     2570551559120
Copy:     140708949432448