Color utilities (text, background) in Bootsrap - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of Bootstrap's color utilities?

Bootstrap's color utilities let you quickly change text and background colors using simple classes, without writing custom CSS.

beginner

How do you change text color to primary in Bootstrap?

Add the class text-primary to your HTML element to make its text color the primary theme color.

beginner

Which class changes the background color to success in Bootstrap?

Use the class bg-success to set the background color to the success theme color.

beginner

What class would you use to make text color white on a dark background?

Use text-white to make text white, which is helpful on dark backgrounds for good contrast.

intermediate

How can you reset background color to transparent using Bootstrap utilities?

Use the class bg-transparent to remove any background color and make it transparent.

Which Bootstrap class changes text color to a warning color?

A text-warning

B bg-warning

C text-danger

D bg-danger

The class text-warning changes the text color to the warning theme color.

What class sets the background color to primary in Bootstrap?

A text-primary

B bg-primary

C background-primary

D primary-bg

The correct class is bg-primary to set background color to primary.

If you want white text on a dark background, which class should you use?

A text-white

B bg-dark

C bg-white

D text-dark

Use text-white to make text white, which stands out on dark backgrounds.

Which class removes background color making it transparent?

A bg-clear

B bg-reset

C bg-none

D bg-transparent

The class bg-transparent sets the background color to transparent.

To make text color red using Bootstrap utilities, which class is correct?

A text-red

B bg-danger

C text-danger

D bg-red

Use text-danger to apply the red (danger) color to text.

Explain how to use Bootstrap color utilities to change text and background colors.

Think about the class prefixes text- and bg-

Describe why using Bootstrap color utilities is helpful for web design.

Consider speed, consistency, and accessibility

Practice

1. Which Bootstrap class would you use to make text color red?

easy

A. bg-red

B. text-danger

C. text-red

D. bg-danger

Solution

1. Step 1: Understand Bootstrap text color classes

   Bootstrap uses text-{color} classes to change text color, where {color} is a predefined color name.

2. Step 2: Identify the correct class for red text

   The class text-danger applies a red color to text. The other options either apply background color or use incorrect class names.

3. Final Answer:

   text-danger -> Option B

4. Quick Check:

   Text color red = text-danger [OK]

Hint: Text color uses text-{color}, background uses bg-{color} [OK]

Common Mistakes:

• Confusing text and background classes
• Using non-existent classes like text-red
• Using bg-danger for text color

2. Which of the following is the correct syntax to set a blue background using Bootstrap?

easy

A. bg-blue

B. text-primary

C. background-blue

D. bg-primary

Solution

1. Step 1: Recall Bootstrap background color classes

   Bootstrap uses bg-{color} classes to set background colors, where {color} is a predefined color name.

2. Step 2: Identify the correct class for blue background

   The class bg-primary sets a blue background. The other options either set text color or use invalid class names.

3. Final Answer:

   bg-primary -> Option D

4. Quick Check:

   Background blue = bg-primary [OK]

Hint: Background color classes start with bg- [OK]

Common Mistakes:

• Using text-primary for background
• Using non-Bootstrap class names like bg-blue
• Confusing text and background prefixes

3. What color will the text have with this HTML snippet?

<p class="text-success">Success message</p>

medium

A. Green

B. Blue

C. Red

D. Yellow

Solution

1. Step 1: Identify the Bootstrap text color class

   The class text-success is used on the paragraph tag.

2. Step 2: Recall the color meaning of text-success

   In Bootstrap, text-success applies a green color to the text.

3. Final Answer:

   Green -> Option A

4. Quick Check:

   text-success = Green [OK]

Hint: Success means green in Bootstrap colors [OK]

Common Mistakes:

• Confusing success with danger (red)
• Mixing text and background colors
• Guessing blue or yellow incorrectly

4. You want to set a yellow background but wrote bg-warningg. What will happen?

medium

A. The text color will change to yellow

B. The background will be yellow as expected

C. The background will be transparent (no color)

D. The page will show an error

Solution

1. Step 1: Check the class name spelling

   The correct class for yellow background is bg-warning, but bg-warningg has an extra 'g' and is invalid.

2. Step 2: Understand how browsers handle invalid classes

   Invalid classes are ignored by the browser, so no background color will be applied, resulting in transparent background.

3. Final Answer:

   The background will be transparent (no color) -> Option C

4. Quick Check:

   Invalid class = no style applied [OK]

Hint: Check spelling carefully; invalid classes do nothing [OK]

Common Mistakes:

• Assuming a typo still applies the color
• Expecting an error message in browser
• Confusing background and text color effects

5. You want to create a button with white text on a red background using Bootstrap classes. Which combination is correct?

hard

A. class="btn bg-danger text-white"

B. class="btn text-danger bg-white"

C. class="btn bg-white text-danger"

D. class="btn bg-danger text-danger"

Solution

1. Step 1: Identify the class for red background

   The class bg-danger sets a red background color in Bootstrap.

2. Step 2: Identify the class for white text

   The class text-white sets the text color to white.

3. Step 3: Combine classes for desired effect

   Using btn bg-danger text-white applies a red background and white text on the button.

4. Final Answer:

   class="btn bg-danger text-white" -> Option A

5. Quick Check:

   Red background + white text = bg-danger + text-white [OK]

Hint: Background red = bg-danger, white text = text-white [OK]

Common Mistakes:

• Mixing text-danger (red text) with bg-danger (red background)
• Using bg-white for background when red is needed
• Using same color for text and background causing unreadable text