Sticky header and footer in Tailwind - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ layout

intermediate

Sticky Header Behavior

Given this Tailwind CSS code for a header, what will happen when you scroll the page?

Tailwind

<header class="sticky top-0 bg-white shadow p-4">Header Content</header>

A The header stays visible at the top of the page while scrolling.

B The header scrolls away with the page content.

C The header becomes fixed at the bottom of the page.

D The header disappears when scrolling down and reappears when scrolling up.

💡 Hint

Think about what the 'sticky' and 'top-0' classes do in Tailwind CSS.

The sticky class makes the element stick to a position when scrolling. top-0 means it sticks to the top edge. So the header stays visible at the top as you scroll.

❓ layout

intermediate

Sticky Footer Positioning

Which Tailwind CSS class combination correctly makes a footer stick to the bottom of the viewport even when the page content is short?

A <footer class="sticky bottom-0 bg-gray-200 p-4">Footer</footer>

B <footer class="absolute bottom-0 bg-gray-200 p-4">Footer</footer>

C <footer class="fixed bottom-0 w-full bg-gray-200 p-4">Footer</footer>

D <footer class="relative bottom-0 bg-gray-200 p-4">Footer</footer>

💡 Hint

Consider which positioning keeps the footer visible at the bottom regardless of content length.

The fixed class positions the footer relative to the viewport, so it stays at the bottom always. sticky only sticks when scrolling past it, which may not work if content is short.

❓ accessibility

advanced

Accessible Sticky Header

Which of these code snippets best improves accessibility for a sticky header in Tailwind CSS?

A <header class="sticky top-0 bg-white p-4" role="banner" aria-label="Main site header">Site Header</header>

B <header class="sticky top-0 bg-white p-4" tabindex="-1">Site Header</header>

C <header class="sticky top-0 bg-white p-4" aria-hidden="true">Site Header</header>

D <header class="sticky top-0 bg-white p-4" role="contentinfo">Site Header</header>

💡 Hint

Think about semantic roles and how screen readers identify page regions.

The role="banner" and aria-label help screen readers understand this is the main header. tabindex="-1" is for focus management but not best here. aria-hidden="true" hides content from assistive tech, which is bad for headers. role="contentinfo" is for footers, not headers.

❓ selector

advanced

CSS Selector for Sticky Footer

Which CSS selector correctly targets only the footer element with class 'sticky-footer' to apply sticky positioning?

A #sticky-footer { position: sticky; bottom: 0; }

B .sticky-footer footer { position: sticky; bottom: 0; }

C footer .sticky-footer { position: sticky; bottom: 0; }

D footer.sticky-footer { position: sticky; bottom: 0; }

💡 Hint

Remember how class selectors and element selectors combine.

footer.sticky-footer selects a footer element with class sticky-footer. Option D selects any footer inside an element with class sticky-footer. Option D selects any element with class sticky-footer inside a footer. Option D selects an element with id sticky-footer, not a class.

🧠 Conceptual

expert

Sticky Header and Footer Layout Challenge

You want a page with a sticky header at the top, a sticky footer at the bottom, and a scrollable main content area between them. Which Tailwind CSS layout approach achieves this correctly?

A

<div class="flex flex-col h-screen">
  <header class="sticky top-0 bg-white p-4">Header</header>
  <main class="flex-1 overflow-auto p-4">Content</main>
  <footer class="sticky bottom-0 bg-gray-200 p-4">Footer</footer>
</div>

B

<div class="flex flex-col h-screen">
  <header class="fixed top-0 w-full bg-white p-4">Header</header>
  <main class="flex-1 overflow-auto p-4 mt-16 mb-16">Content</main>
  <footer class="fixed bottom-0 w-full bg-gray-200 p-4">Footer</footer>
</div>

C

<div class="flex flex-col min-h-screen">
  <header class="sticky top-0 bg-white p-4">Header</header>
  <main class="flex-grow overflow-auto p-4">Content</main>
  <footer class="sticky bottom-0 bg-gray-200 p-4">Footer</footer>
</div>

D

<div class="grid grid-rows-[auto_1fr_auto] h-screen">
  <header class="sticky top-0 bg-white p-4">Header</header>
  <main class="overflow-auto p-4">Content</main>
  <footer class="sticky bottom-0 bg-gray-200 p-4">Footer</footer>
</div>

💡 Hint

Think about how fixed positioning works and how to prevent content from hiding behind header/footer.

Option B uses fixed positioning for header and footer, which keeps them always visible. The main content has top and bottom margins to avoid being hidden behind them. Options A, C, and D use sticky which does not guarantee footer stays visible if content is short or no scrolling occurs.

Practice

1. What does the Tailwind class sticky do when applied to a header or footer?

easy

A. It makes the element disappear after scrolling 100px.

B. It hides the element when scrolling down.

C. It keeps the element visible at a fixed position while scrolling.

D. It changes the element's color on scroll.

Solution

1. Step 1: Understand the sticky class behavior

   The sticky class makes an element stick to a position relative to the viewport when scrolling.

2. Step 2: Apply to header or footer context

   When used on a header or footer, it keeps that element visible at the top or bottom as the page scrolls.

3. Final Answer:

   It keeps the element visible at a fixed position while scrolling. -> Option C

4. Quick Check:

   Sticky = fixed visibility on scroll [OK]

Hint: Sticky means element stays visible while scrolling [OK]

Common Mistakes:

• Confusing sticky with fixed positioning
• Thinking sticky hides elements on scroll
• Assuming sticky changes colors automatically

2. Which Tailwind classes correctly create a sticky footer that stays at the bottom of the viewport?

easy

A. sticky bottom-0

B. sticky top-0

C. fixed bottom-0

D. absolute bottom-0

Solution

1. Step 1: Identify sticky footer classes

   To make a footer sticky at the bottom, use sticky with bottom-0 so it sticks to the bottom edge.

2. Step 2: Compare other options

   top-0 sticks to top, fixed is different positioning, and absolute does not stick on scroll.

3. Final Answer:

   <code>sticky bottom-0</code> -> Option A

4. Quick Check:

   Sticky + bottom-0 = sticky footer [OK]

Hint: Use sticky with bottom-0 for sticky footer [OK]

Common Mistakes:

• Using top-0 for footer instead of bottom-0
• Confusing fixed with sticky positioning
• Using absolute which doesn't stick on scroll

3. What will happen if you apply sticky top-0 bg-white shadow classes to a header element in Tailwind CSS?

medium

A. The header becomes fixed and covers the whole page.

B. The header scrolls away and has no background or shadow.

C. The header sticks to the bottom with transparent background.

D. The header sticks to the top with white background and shadow while scrolling.

Solution

1. Step 1: Analyze the classes

   sticky top-0 makes the header stick to the top of the viewport. bg-white sets a white background. shadow adds a subtle shadow.

2. Step 2: Predict visual effect on scroll

   The header stays visible at the top with white background and shadow as the user scrolls down the page.

3. Final Answer:

   The header sticks to the top with white background and shadow while scrolling. -> Option D

4. Quick Check:

   sticky top-0 + bg-white + shadow = sticky visible header [OK]

Hint: sticky top-0 keeps header visible with styles [OK]

Common Mistakes:

• Thinking sticky hides header on scroll
• Confusing bottom-0 with top-0
• Ignoring background and shadow effects

4. You want a sticky header but it disappears behind other content when scrolling. Which Tailwind class should you add to fix this?

medium

A. opacity-50

B. z-50

C. hidden

D. overflow-hidden

Solution

1. Step 1: Understand the problem

   The sticky header is behind other content, meaning it has a lower stacking order (z-index).

2. Step 2: Use z-index to fix stacking

   Adding z-50 increases the z-index, bringing the header above other elements.

3. Final Answer:

   z-50 -> Option B

4. Quick Check:

   Use z-50 to fix sticky header layering [OK]

Hint: Add z-50 to bring sticky header above content [OK]

Common Mistakes:

• Using opacity which changes transparency
• Using hidden which hides the element
• Using overflow-hidden which clips content

5. You want a page with a sticky header and footer using Tailwind. The header should stick at top, footer at bottom, and main content scrolls between them. Which code snippet correctly implements this?

hard

A. Header\nContent\nFooter

B. Header\nContent\nFooter

C. Header\nContent\nFooter

D. Header\nContent\nFooter

Solution

1. Step 1: Check header and footer sticky positions

   Header
   \n
   Content
   \n
   Footer
   uses sticky top-0 for header and sticky bottom-0 for footer, which is correct for sticky header and footer.

2. Step 2: Verify main content scroll area

   Main uses overflow-auto and height calculated as full viewport minus header/footer height, allowing scrolling between sticky elements.

3. Step 3: Compare other options

   Header
   \n
   Content
   \n
   Footer
   uses fixed positioning which overlays content;
   Header
   \n
   Content
   \n
   Footer
   swaps top and bottom for header/footer incorrectly;
   Header
   \n
   Content
   \n
   Footer
   uses absolute which does not stick on scroll.

4. Final Answer:

   Option A code snippet correctly implements sticky header and footer with scrollable main content. -> Option A

5. Quick Check:

   Sticky top-0 + sticky bottom-0 + scrollable main = correct layout [OK]

Hint: Use sticky top-0 and bottom-0 with scrollable main [OK]

Common Mistakes:

• Using fixed instead of sticky causing overlap
• Swapping top and bottom classes on header/footer
• Not setting main content height for scrolling