Dark variant usage in Tailwind - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply a dark background color using Tailwind CSS.

Tailwind

<div class="bg-white [1]:bg-gray-800 p-4">
  <p class="text-black dark:text-white">Hello, world!</p>
</div>

Drag options to blanks, or click blank then click option'

Adark

Bactive

Chover

Dfocus

Attempts:

3 left

💡 Hint

Common Mistakes

Using hover or focus variants instead of dark.

Forgetting to enable dark mode in Tailwind config.

The dark variant applies styles when the user prefers dark mode. Here, dark:bg-gray-800 sets a dark background in dark mode.

2fill in blank

medium

Complete the code to change text color in dark mode using Tailwind CSS.

Tailwind

<p class="text-gray-900 [1]:text-gray-100">This text changes color in dark mode.</p>

Drag options to blanks, or click blank then click option'

Adark

Bfocus

Chover

Dactive

Attempts:

3 left

💡 Hint

Common Mistakes

Using hover or focus variants instead of dark.

Not enabling dark mode in Tailwind config.

The dark variant changes the text color when dark mode is active.

3fill in blank

hard

Fix the error in the code to correctly apply dark mode background color.

Tailwind

<div class="bg-white [1]:bg-gray-900 p-6">
  Dark mode background example.
</div>

Drag options to blanks, or click blank then click option'

Aactive

Bhover

Cfocus

Ddark

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variant other than dark for dark mode styling.

Missing the colon after the variant.

The correct variant prefix for dark mode is dark. It should be dark:bg-gray-900.

4fill in blank

hard

Fill both blanks to apply dark mode text and background colors.

Tailwind

<section class="[1]:bg-gray-900 [2]:text-gray-100 p-8">
  Dark mode styled section.
</section>

Drag options to blanks, or click blank then click option'

Adark

Bhover

Dfocus

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variants for background and text colors.

Forgetting the colon after the variant.

Both background and text color changes use the dark variant to apply styles in dark mode.

5fill in blank

hard

Fill all three blanks to create a button with dark mode background, text, and border colors.

Tailwind

<button class="bg-white [1]:bg-gray-800 text-black [2]:text-white border border-gray-300 [3]:border-gray-600 px-4 py-2 rounded">
  Dark Mode Button
</button>

Drag options to blanks, or click blank then click option'

Ahover

Bdark

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variants for different styles.

Missing the colon after the variant.

All three styles use the dark variant to change background, text, and border colors in dark mode.

Practice

1. What does the dark: prefix do in Tailwind CSS?

easy

A. Applies styles only when dark mode is active

B. Applies styles only on hover

C. Applies styles only on small screens

D. Applies styles only when JavaScript is enabled

Solution

1. Step 1: Understand the dark: prefix purpose

   The dark: prefix in Tailwind CSS is used to apply styles only when the website is in dark mode.

2. Step 2: Compare with other prefixes

   Other prefixes like hover: or sm: apply styles on hover or small screens, not related to dark mode.

3. Final Answer:

   Applies styles only when dark mode is active -> Option A

4. Quick Check:

   dark: = dark mode styles [OK]

Hint: Remember dark: means styles for dark mode only [OK]

Common Mistakes:

• Confusing dark: with hover: or responsive prefixes
• Thinking dark: applies styles always
• Not enabling dark mode in config

2. Which of the following is the correct syntax to change text color to white only in dark mode using Tailwind?

easy

A. text-white dark:text-black

B. dark-text-white

C. text-white:dark

D. dark:text-white

Solution

1. Step 1: Identify correct dark mode syntax

   Tailwind uses dark: prefix before the utility class to apply styles in dark mode, so dark:text-white is correct.

2. Step 2: Check other options for syntax errors

   text-white dark:text-black applies white text always and black text in dark mode, which is reversed. Options B and C have invalid syntax.

3. Final Answer:

   dark:text-white -> Option D

4. Quick Check:

   Correct dark mode prefix = dark: [OK]

Hint: Use dark: before utility class, no colon after class [OK]

Common Mistakes:

• Placing :dark after class name
• Using dash instead of colon in dark prefix
• Reversing colors for dark and light modes

3. What will be the background color of the button when dark mode is enabled?

<button class="bg-white dark:bg-gray-800 text-black dark:text-white p-4">Click Me</button>

medium

A. Gray-800 background with white text

B. White background with white text

C. White background with black text

D. Gray-800 background with black text

Solution

1. Step 1: Analyze classes for dark mode

   The button has bg-white and dark:bg-gray-800, so in dark mode background changes to gray-800.

2. Step 2: Analyze text color in dark mode

   Text color is text-black normally and dark:text-white in dark mode, so text becomes white.

3. Final Answer:

   Gray-800 background with white text -> Option A

4. Quick Check:

   dark:bg-gray-800 + dark:text-white = Gray-800 background with white text [OK]

Hint: dark: overrides normal styles in dark mode [OK]

Common Mistakes:

• Ignoring dark: prefix effects
• Mixing text and background colors
• Assuming colors stay same in dark mode

4. You wrote this code but dark mode styles are not applying:

<div class="dark:bg-black bg-white">Content</div>

What is the most likely reason?

medium

A. You should use dark-bg-black instead

B. The order of classes is wrong

C. You forgot to enable dark mode in Tailwind config

D. Dark mode styles only work on buttons

Solution

1. Step 1: Check Tailwind dark mode setup

   Dark mode styles require enabling dark mode in Tailwind config file. Without it, dark: classes won't work.

2. Step 2: Verify class syntax and usage

   Class order does not affect dark mode. dark-bg-black is invalid syntax. Dark mode works on any element, not just buttons.

3. Final Answer:

   You forgot to enable dark mode in Tailwind config -> Option C

4. Quick Check:

   Enable dark mode in config = dark styles work [OK]

Hint: Enable dark mode in config before using dark: classes [OK]

Common Mistakes:

• Not enabling dark mode in tailwind.config.js
• Using wrong class syntax for dark mode
• Thinking dark mode only applies to certain elements

5. You want a card component that has a white background and black text in light mode, but in dark mode it should have a dark gray background and light gray text. Which Tailwind classes achieve this correctly?

<div class="?">Card Content</div>

hard

A. bg-gray-900 text-gray-300 dark:bg-white dark:text-black

B. bg-white text-black dark:bg-gray-900 dark:text-gray-300

C. bg-white dark:bg-gray-900 text-gray-300 dark:text-black

D. dark:bg-white dark:text-black bg-gray-900 text-gray-300

Solution

1. Step 1: Identify light mode styles

   Light mode requires white background and black text, so bg-white text-black are correct for light mode.

2. Step 2: Identify dark mode styles

   Dark mode requires dark gray background and light gray text, so dark:bg-gray-900 dark:text-gray-300 apply these styles in dark mode.

3. Step 3: Check other options for correctness

   bg-gray-900 text-gray-300 dark:bg-white dark:text-black reverses light and dark mode colors. bg-white dark:bg-gray-900 text-gray-300 dark:text-black mixes text colors incorrectly. dark:bg-white dark:text-black bg-gray-900 text-gray-300 places dark mode classes before light mode, which is allowed but colors are reversed.

4. Final Answer:

   bg-white text-black dark:bg-gray-900 dark:text-gray-300 -> Option B

5. Quick Check:

   Light mode white/black + dark mode gray/gray = bg-white text-black dark:bg-gray-900 dark:text-gray-300 [OK]

Hint: Light mode classes first, dark: prefix for dark mode styles [OK]

Common Mistakes:

• Swapping light and dark mode colors
• Placing dark: classes incorrectly
• Using wrong color shades for readability