Justify content in CSS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the CSS property justify-content do?

justify-content controls how items are spaced along the main axis in a flex or grid container. It helps align items horizontally or vertically depending on the layout direction.

beginner

Name three common values for justify-content and what they do.

• flex-start: Items align at the start of the container.
• center: Items are centered in the container.
• space-between: Items spread out with equal space between them.

intermediate

How does justify-content behave differently in a flex container with flex-direction: row versus flex-direction: column?

In row direction, justify-content aligns items horizontally. In column direction, it aligns items vertically along the container's main axis.

intermediate

What is the difference between space-between and space-around in justify-content?

space-between puts equal space between items but no space at the container edges. space-around adds equal space around all items, so edges have half the space compared to between items.

beginner

Why is justify-content important for responsive design?

It helps control how items adjust their spacing inside flexible containers on different screen sizes, making layouts look balanced and neat on phones, tablets, and desktops.

Which justify-content value aligns items to the center of the container?

A flex-end

B flex-start

C center

D space-between

center places items in the middle of the container along the main axis.

What does justify-content: space-between; do?

A Adds equal space around all items including edges

B Aligns items at the end of the container

C Aligns items at the start of the container

D Distributes items with equal space between them but no space at edges

space-between puts equal space between items but no extra space at container edges.

If a flex container has flex-direction: column;, how does justify-content behave?

A Aligns items vertically along the container's main axis

B Aligns items horizontally

C Has no effect

D Aligns items diagonally

With column direction, the main axis is vertical, so justify-content aligns items vertically.

Which justify-content value places all items at the end of the container?

A flex-start

B flex-end

C center

D space-around

flex-end aligns items to the end of the main axis inside the container.

Why should you use justify-content in a flexbox layout?

A To control spacing and alignment of items along the main axis

B To change the font size of items

C To add borders around items

D To change the background color

justify-content controls how items are spaced and aligned along the main axis in flexbox or grid containers.

Explain how the justify-content property affects the layout of items in a flex container.

Think about how items line up horizontally or vertically depending on flex direction.

Describe the difference between space-between and space-around values in justify-content.

Imagine placing chairs in a row with or without space at the ends.

Practice

1. What does the CSS property justify-content control in a flex container?

easy

A. The vertical alignment of items inside the container

B. The horizontal alignment of items inside the container

C. The size of the container

D. The color of the items

Solution

1. Step 1: Understand the role of justify-content

   This property controls how items are aligned horizontally inside a flex or grid container.

2. Step 2: Differentiate from vertical alignment

   Vertical alignment is controlled by align-items, not justify-content.

3. Final Answer:

   The horizontal alignment of items inside the container -> Option B

4. Quick Check:

   Justify content = horizontal alignment [OK]

Hint: Justify content aligns items left to right [OK]

Common Mistakes:

• Confusing justify-content with align-items
• Thinking it changes item size
• Assuming it controls colors

2. Which of the following is the correct syntax to center items horizontally using justify-content in a flex container?

easy

A. justify-content: center-items;

B. justify-content: middle;

C. justify-content: align-center;

D. justify-content: center;

Solution

1. Step 1: Recall valid values for justify-content

   Common valid values include flex-start, center, space-between, and space-around.

2. Step 2: Identify the correct syntax for centering

   The correct value to center items horizontally is center, so the syntax is justify-content: center;.

3. Final Answer:

   justify-content: center; -> Option D

4. Quick Check:

   Centering uses 'center' value [OK]

Hint: Use 'center' exactly to center items [OK]

Common Mistakes:

• Using invalid values like 'middle' or 'align-center'
• Missing the colon or semicolon
• Confusing with align-items syntax

3. Given this CSS and HTML, what will be the horizontal spacing of the items inside the container?

div.container {
  display: flex;
  justify-content: space-between;
  width: 300px;
}

<div class="container">
  <div>Item 1</div>
  <div>Item 2</div>
  <div>Item 3</div>
</div>

medium

A. Items are grouped together on the left

B. Items are centered with equal space around them

C. Items are evenly spaced with equal space between them

D. Items are aligned to the right

Solution

1. Step 1: Understand justify-content: space-between;

   This value places the first item at the start, the last item at the end, and evenly distributes space between the items.

2. Step 2: Visualize the layout

   With three items, the spaces between them are equal, but no extra space is added at the container edges.

3. Final Answer:

   Items are evenly spaced with equal space between them -> Option C

4. Quick Check:

   Space-between = equal gaps between items [OK]

Hint: Space-between puts equal gaps only between items [OK]

Common Mistakes:

• Thinking space-between adds space around edges
• Confusing with space-around or center
• Assuming items cluster on one side

4. Identify the error in this CSS code that prevents justify-content from working:

div.container {
  display: block;
  justify-content: center;
}

medium

A. The container must have display: flex; or display: grid; for justify-content to work

B. The property name should be justify-items instead

C. The value 'center' is invalid for justify-content

D. The container needs a fixed width

Solution

1. Step 1: Check the display property

   justify-content only works on flex or grid containers, but here display is set to block.

2. Step 2: Understand the requirement for flex/grid

   Without display: flex; or display: grid;, justify-content has no effect.

3. Final Answer:

   The container must have display: flex; or display: grid; for justify-content to work -> Option A

4. Quick Check:

   Justify-content needs flex or grid [OK]

Hint: Use flex or grid display for justify-content to work [OK]

Common Mistakes:

• Using justify-content on block containers
• Confusing justify-content with justify-items
• Thinking value 'center' is invalid

5. You want to create a navigation bar with 4 links spaced evenly across the width, but with equal space around each link (including edges). Which justify-content value should you use in your flex container?

hard

A. space-around

B. flex-start

C. center

D. space-between

Solution

1. Step 1: Understand the difference between space-between and space-around

   space-between puts equal space only between items, no space at edges. space-around adds equal space around each item, including edges.

2. Step 2: Match requirement to property value

   Since the requirement is equal space around each link including edges, space-around is the correct choice.

3. Final Answer:

   space-around -> Option A

4. Quick Check:

   Space-around = equal space around all items [OK]

Hint: Use space-around for equal space including edges [OK]

Common Mistakes:

• Choosing space-between which skips edges
• Using center which groups items
• Using flex-start which aligns left only