Equal-width columns in Bootsrap - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does 'equal-width columns' mean in Bootstrap?

It means columns that automatically share the available space equally, no matter how many columns you have.

beginner

How do you create equal-width columns in Bootstrap?

Use the class col on each column inside a row. Bootstrap will make them all the same width automatically.

beginner

What happens if you add more columns with the <code>col</code> class inside a row?

Bootstrap divides the row’s width equally among all columns, so each column gets the same width.

intermediate

Can equal-width columns adjust on different screen sizes?

Yes! Bootstrap’s grid is responsive, so equal-width columns resize proportionally on smaller screens.

beginner

Why is using equal-width columns helpful in web design?

It makes layouts simple and neat without needing to set exact widths. It also helps keep content balanced and easy to read.

Which Bootstrap class creates equal-width columns inside a row?

A col-auto

B container

C col

D row

The col class makes columns share space equally inside a row.

If you have three col columns in a row, how wide is each column?

A One third of the row width

B One half of the row width

C Full width of the row

D Width depends on content

Bootstrap divides the row width equally, so each of three columns gets one third.

What happens to equal-width columns on small screens in Bootstrap?

A They disappear

B They stay side by side, resizing proportionally

C They stack vertically

D They become invisible

Bootstrap’s grid is responsive; equal-width columns stay side-by-side but resize proportionally on small screens.

Which container holds columns in Bootstrap’s grid system?

A col

B section

C container-fluid

D row

Columns with col classes must be inside a row to work properly.

Why might you choose equal-width columns over fixed-width columns?

A They adjust automatically to screen size

B They require manual width settings

C They are harder to maintain

D They don’t work on mobile

Equal-width columns adjust automatically, making layouts flexible and easier to maintain.

Explain how to create equal-width columns in Bootstrap and why it is useful.

Think about how Bootstrap shares space among columns.

Describe what happens to equal-width columns on different screen sizes in Bootstrap.

Consider how the layout changes on phones versus desktops.

Practice

1. What does using class="col" inside a row in Bootstrap do?

easy

A. Creates columns with fixed pixel widths

B. Creates columns that are always stacked vertically

C. Creates columns that share the row's width equally

D. Creates columns that ignore the row container

Solution

1. Step 1: Understand Bootstrap's grid system

   Bootstrap uses rows and columns to create layouts. The col class means the column will share space equally with other col siblings.

2. Step 2: Effect of col inside a row

   When multiple col classes are inside a row, they automatically divide the row's width evenly.

3. Final Answer:

   Creates columns that share the row's width equally -> Option C

4. Quick Check:

   Equal-width columns = col inside row [OK]

Hint: Remember: col means equal width columns [OK]

Common Mistakes:

• Thinking col sets fixed pixel widths
• Assuming columns always stack vertically
• Believing columns ignore the row container

2. Which of the following is the correct syntax to create three equal-width columns in Bootstrap?

easy

A.

B.

C.

D.

Solution

1. Step 1: Identify the container for columns

   Bootstrap columns must be inside a row to work properly.

2. Step 2: Check column classes for equal width

   Using col without a number creates equal-width columns automatically.

3. Final Answer:

   <div class="row"><div class="col"></div><div class="col"></div><div class="col"></div></div> -> Option A

4. Quick Check:

   Equal-width columns need col inside row [OK]

Hint: Use col inside row for equal widths [OK]

Common Mistakes:

• Using col outside a row
• Using fixed width classes like col-4 for equal widths
• Not wrapping columns in a row

3. What will be the visual result of this code?

<div class="row">
  <div class="col">A</div>
  <div class="col">B</div>
  <div class="col">C</div>
</div>

medium

A. Three columns with different widths depending on content

B. Three stacked rows labeled A, B, and C

C. One column with A, B, and C stacked vertically

D. Three columns of equal width side by side labeled A, B, and C

Solution

1. Step 1: Analyze the use of col classes inside row

   Each col inside a row creates a column that shares the row's width equally.

2. Step 2: Predict the layout

   The three columns labeled A, B, and C will appear side by side with equal widths.

3. Final Answer:

   Three columns of equal width side by side labeled A, B, and C -> Option D

4. Quick Check:

   Equal-width columns render side by side [OK]

Hint: Equal col inside row means side-by-side equal columns [OK]

Common Mistakes:

• Thinking columns stack vertically by default
• Assuming columns size by content width
• Confusing col with fixed width classes

4. Identify the error in this Bootstrap code for equal-width columns:

<div class="container">
  <div class="col">One</div>
  <div class="col">Two</div>
</div>

medium

A. Missing row container around the columns

B. Using container instead of row

C. Columns should have fixed width classes like col-6

D. No error, code is correct

Solution

1. Step 1: Check Bootstrap structure rules

   Columns (col) must be inside a row to work properly.

2. Step 2: Identify missing row

   The code has container but no row wrapping the columns, so columns won't behave as expected.

3. Final Answer:

   Missing row container around the columns -> Option A

4. Quick Check:

   Columns need row wrapper [OK]

Hint: Always wrap col inside row [OK]

Common Mistakes:

• Skipping the row wrapper
• Confusing container with row
• Thinking fixed width classes are required for equal columns

5. You want to create four equal-width columns that stack vertically on small screens but appear side by side on medium and larger screens. Which Bootstrap classes should you use?

hard

A. col inside a container

B. col-md inside a row

C. col-sm inside a row

D. col-lg inside a container

Solution

1. Step 1: Understand responsive column classes

   Bootstrap uses breakpoint prefixes like col-md to apply column widths starting at medium screen sizes.

2. Step 2: Choose classes for stacking on small and equal width on medium+

   Using col-md inside a row means columns stack vertically on small screens and become equal-width side by side on medium and larger screens.

3. Final Answer:

   col-md inside a row -> Option B

4. Quick Check:

   Use col-md for medium+ equal columns, stack below [OK]

Hint: Use breakpoint classes like col-md for responsive equal columns [OK]

Common Mistakes:

• Using col without breakpoint for responsive stacking
• Not wrapping columns in a row
• Using container instead of row for columns