Blur and brightness filters in Tailwind - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the blur filter do in Tailwind CSS?

The blur filter makes an element look fuzzy or out of focus by softening its edges. It is like looking through frosted glass.

beginner

How do you apply a brightness filter in Tailwind CSS?

You use classes like brightness-50 to make an element darker or brightness-150 to make it brighter. The number is a percentage of the original brightness.

intermediate

What is the effect of filter utility in Tailwind CSS?

The filter utility enables CSS filter effects like blur and brightness on an element. Without it, filter classes won’t work.

beginner

Which Tailwind class would you use to add a small blur effect?

Use blur-sm to add a small blur effect that slightly softens the element’s edges.

intermediate

How can you combine blur and brightness filters in Tailwind CSS?

Add the <code>filter</code> class plus both <code>blur-*</code> and <code>brightness-*</code> classes on the same element. For example: <code>filter blur-md brightness-125</code>.

Which Tailwind class enables filter effects like blur and brightness?

A filter

B blur

C brightness

D shadow

The filter class activates CSS filter effects. Without it, blur or brightness classes won’t apply.

What does brightness-75 do to an element?

A Removes brightness

B Makes it 75% as bright as normal

C Increases brightness by 75%

D Makes it 75% blurry

brightness-75 reduces brightness to 75% of the original, making the element darker.

Which class adds a medium blur effect in Tailwind?

A blur-md

B blur-lg

C blur-sm

D blur-none

blur-md applies a medium level of blur to soften edges.

How do you apply both blur and brightness filters together?

A Use only <code>brightness-*</code> class

B Use only <code>blur-*</code> class

C Add <code>filter</code> plus both <code>blur-*</code> and <code>brightness-*</code> classes

D Add <code>shadow</code> class

You must add filter plus both filter classes to combine effects.

What visual effect does blur-sm create?

A No effect

B A bright glow

C A shadow behind the element

D A slight fuzzy or soft look

blur-sm softly blurs the element’s edges for a subtle fuzzy look.

Explain how to use Tailwind CSS to make an image look blurry and darker at the same time.

Remember you need the filter class to activate effects.

Describe the difference between blur-sm and blur-lg in Tailwind CSS.

Think about how much the image looks fuzzy.

Practice

1. What does the Tailwind class blur-sm do to an element?

easy

A. It makes the element slightly blurry.

B. It increases the brightness of the element.

C. It adds a shadow around the element.

D. It changes the element's color to gray.

Solution

1. Step 1: Understand the blur-sm class

   The blur-sm class applies a small blur filter, making the element look fuzzy.

2. Step 2: Compare with other effects

   Brightness changes lightness, shadow adds shadow, and gray changes color, so these are different effects.

3. Final Answer:

   It makes the element slightly blurry. -> Option A

4. Quick Check:

   Blur = fuzzy effect [OK]

Hint: Blur classes add fuzziness, brightness changes lightness [OK]

Common Mistakes:

• Confusing blur with brightness
• Thinking blur adds shadow
• Assuming blur changes color

2. Which Tailwind class correctly applies 125% brightness to an element?

easy

A. bright-125

B. brightness-1.25

C. brightness125

D. brightness-125

Solution

1. Step 1: Recall Tailwind brightness syntax

   Tailwind uses brightness- followed by a number like 125 for 125% brightness.

2. Step 2: Check each option

   Only brightness-125 matches Tailwind's correct syntax; others are invalid.

3. Final Answer:

   brightness-125 -> Option D

4. Quick Check:

   Correct class = brightness-125 [OK]

Hint: Brightness classes use dash and number, like brightness-125 [OK]

Common Mistakes:

• Using dot instead of dash
• Omitting dash between brightness and number
• Using wrong prefix like bright

3. What visual effect will this code produce?

<div class="blur-md brightness-75">Hello</div>

medium

A. The text will be blurry and brighter than normal.

B. The text will be sharp and brighter than normal.

C. The text will be blurry and darker than normal.

D. The text will be sharp and darker than normal.

Solution

1. Step 1: Analyze the blur-md class

   blur-md applies a medium blur, making the text fuzzy.

2. Step 2: Analyze the brightness-75 class

   brightness-75 reduces brightness to 75%, making the text darker.

3. Final Answer:

   The text will be blurry and darker than normal. -> Option C

4. Quick Check:

   Blur = fuzzy, brightness 75% = darker [OK]

Hint: Lower brightness means darker; blur means fuzzy [OK]

Common Mistakes:

• Mixing up brightness values (higher means brighter)
• Assuming blur sharpens text
• Ignoring combined effects

4. Identify the error in this Tailwind usage:

<img class="blur-4xl brightness-150" src="photo.jpg" alt="Photo" />

medium

A. The class blur-4xl does not exist in Tailwind.

B. The brightness value 150 is invalid; max is 100.

C. The alt attribute is missing for accessibility.

D. The src attribute should be inside quotes.

Solution

1. Step 1: Check blur class validity

   Tailwind supports blur sizes like sm, md, lg, xl, 2xl, 3xl but not 4xl.

2. Step 2: Verify brightness and attributes

   Brightness-150 is valid (150%), alt attribute is present, src is correctly quoted.

3. Final Answer:

   The class blur-4xl does not exist in Tailwind. -> Option A

4. Quick Check:

   Invalid blur class = blur-4xl [OK]

Hint: Check Tailwind docs for valid blur sizes [OK]

Common Mistakes:

• Assuming any 'xl' size exists
• Thinking brightness max is 100%
• Ignoring alt attribute importance

5. You want a button that becomes brighter and less blurry when hovered. Which Tailwind classes achieve this?

<button class="?">Click Me</button>

hard

A. blur-none brightness-125 hover:blur-lg hover:brightness-75 transition

B. blur-lg brightness-75 hover:blur-none hover:brightness-125 transition

C. blur-md brightness-100 hover:blur-md hover:brightness-100

D. blur-sm brightness-50 hover:blur-sm hover:brightness-50

Solution

1. Step 1: Understand the base state

   The button starts blurry and darker with blur-lg brightness-75.

2. Step 2: Understand the hover state

   On hover, blur is removed (blur-none) and brightness increases to 125% (brightness-125), making it clearer and brighter.

3. Step 3: Confirm transition for smooth effect

   transition enables smooth change on hover.

4. Final Answer:

   blur-lg brightness-75 hover:blur-none hover:brightness-125 transition -> Option B

5. Quick Check:

   Hover removes blur and brightens = blur-lg brightness-75 hover:blur-none hover:brightness-125 transition [OK]

Hint: Use hover:blur-none and hover:brightness-125 for clearer, brighter hover [OK]

Common Mistakes:

• Reversing hover effects
• Forgetting transition class
• Using same blur and brightness on hover