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Build a Responsive Card Grid with CSS Flexbox | CompileQuestHub

Build a Responsive Card Grid with CSS Flexbox

5/22/2026 • Updated 5/26/2026 • CSSFlexboxResponsive DesignWeb DevelopmentBeginner

Challenge Goal

In this beginner-friendly CSS coding challenge, you will build a responsive product card grid using Flexbox. The layout should adapt to different screen sizes, showing multiple cards per row on larger screens and a single card per row on mobile devices.

What You Will Build

You will style a simple product showcase page with six cards. Your goal is to use CSS Flexbox to create a clean, centered, responsive card layout.

The final layout should display:

Four cards per row on large desktop screens.
Two cards per row on tablet-sized screens.
One card per row on mobile screens.

Concept Overview

Flexbox is a CSS layout system that helps you arrange items in rows or columns. It is especially useful for navigation bars, card layouts, buttons, and sections where items need flexible spacing and alignment.

In this challenge, you will practice:

Creating a flex container with display: flex;.
Allowing items to wrap with flex-wrap: wrap;.
Centering items with justify-content: center;.
Adding consistent spacing with gap.
Controlling card width with flex-basis.
Using media queries for responsive breakpoints.

Example

Here is a simple Flexbox card container:

.card-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.card {
  flex: 0 1 250px;
}

This allows cards to line up in rows, wrap when there is not enough space, and stay centered inside the container.

Coding Challenge

Use the starter code below and update the CSS to make the card grid responsive. Focus on Flexbox only. Do not use CSS Grid for this challenge.

Requirements

Create a product card layout using Flexbox.
The card container must use display: flex;.
The cards must wrap onto new rows when needed.
Cards must have consistent spacing between them.
The layout must stay centered horizontally.
On screens wider than 1024px, display four cards per row.
On screens from 768px to 1023px, display two cards per row.
On screens narrower than 768px, display one card per row.
The page must remain readable and usable on mobile devices.

Input and Output

Input

This challenge does not require user input. You will write CSS styles for an existing HTML structure.

Output

When opened in a browser, the product cards should automatically rearrange based on the screen width.

Desktop: 4 cards per row
Tablet: 2 cards per row
Mobile: 1 card per row

Constraints

Use Flexbox for the layout.
Do not use CSS Grid.
Do not use external CSS frameworks.
Do not use JavaScript.
Keep the HTML structure unchanged.
Only update the CSS.

Hints

Add display: flex; to the card container.
Add flex-wrap: wrap; so cards can move to the next row.
Use gap to create spacing between cards.
Use justify-content: center; to center the rows.
Use calc() to control the card width while accounting for gaps.
Use media queries to change card widths for tablet and mobile screens.

Starter Code

Copy this starter code into your project. Complete the missing Flexbox styles in styles.css.

<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Responsive Card Grid</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <main>
    <h1>Product Showcase</h1>

    <section class="card-container" aria-label="Product cards">
      <article class="card">
        <h2>Product 1</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 2</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 3</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 4</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 5</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 6</h2>
        <p>A short product description goes here.</p>
      </article>
    </section>
  </main>
</body>
</html>

/* styles.css */
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f9fafb;
  color: #1f2937;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
}

.card-container {
  /* Add Flexbox styles here */
}

.card {
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

Solution Walkthrough

Step 1: Create the flex container

Add display: flex; to .card-container. This makes the cards flex items.

Step 2: Allow wrapping

Add flex-wrap: wrap; so cards can move to the next row when the screen gets smaller.

Step 3: Add spacing and alignment

Use gap for consistent spacing and justify-content: center; to keep the cards centered.

Step 4: Set desktop card widths

Use flex: 0 1 calc(25% - 1.5rem); so four cards fit per row on large screens.

Step 5: Add responsive breakpoints

Use media queries to change the card width to two columns on tablets and one column on mobile screens.

Solution

/* styles.css */
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f9fafb;
  color: #1f2937;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
}

.card-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.card {
  flex: 0 1 calc(25% - 1.5rem);
  box-sizing: border-box;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card h2 {
  margin-top: 0;
}

.card p {
  line-height: 1.6;
}

@media (max-width: 1023px) {
  .card {
    flex-basis: calc(50% - 1.5rem);
  }
}

@media (max-width: 767px) {
  main {
    padding: 1rem;
  }

  .card {
    flex-basis: 100%;
  }
}

Why This Works

The .card-container becomes a Flexbox container, and each .card becomes a flex item. The flex-wrap property allows cards to move to new rows, while gap keeps spacing consistent. Media queries change the card width at specific screen sizes so the layout becomes responsive.

Stretch Goals

Add a hover effect that slightly lifts each card.
Add product images and make them responsive.
Add buttons inside each card.
Add a featured card style for one product.
Use CSS variables for colors, spacing, and border radius.
Rebuild the same layout using CSS Grid and compare the difference.

Quick Checklist

Does the container use display: flex;?
Does the container use flex-wrap: wrap;?
Are the cards evenly spaced with gap?
Does the desktop layout show four cards per row?
Does the tablet layout show two cards per row?
Does the mobile layout show one card per row?
Did you avoid using CSS Grid?

Support

Keep CompileQuestHub free

If this challenge helped you, support more open tutorials and code examples.

Support the site Start Here

Need More?

Request a topic or report an issue

Use the contact form to request follow-up tutorials or report broken code, missing files, or outdated links.

Request a topic Report a problem

Page Info

Freshness and topics

Topic: CSS

Difficulty: Beginner

Reading time: 6 min read

Published: 5/22/2026

Updated: 5/26/2026

#CSS #Flexbox #Responsive Design #Web Development

Before You Start

Prerequisites

Basic HTML knowledge
Understanding of CSS selectors

Outcome

What you will learn

Apply Flexbox properties to create flexible layouts
Use media queries to build responsive designs
Control spacing and alignment with gap and justify-content
Develop a mobile-first card grid without CSS Grid

Learning Path

CSS Foundations

Continue this sequence from the series page and move through the lessons in order.

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Build a Responsive Card Grid with CSS Flexbox

5/22/2026 • Updated 5/26/2026 • CSSFlexboxResponsive DesignWeb DevelopmentBeginner

Challenge Goal

What You Will Build

You will style a simple product showcase page with six cards. Your goal is to use CSS Flexbox to create a clean, centered, responsive card layout.

The final layout should display:

Four cards per row on large desktop screens.
Two cards per row on tablet-sized screens.
One card per row on mobile screens.

Concept Overview

In this challenge, you will practice:

Creating a flex container with display: flex;.
Allowing items to wrap with flex-wrap: wrap;.
Centering items with justify-content: center;.
Adding consistent spacing with gap.
Controlling card width with flex-basis.
Using media queries for responsive breakpoints.

Example

Here is a simple Flexbox card container:

.card-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.card {
  flex: 0 1 250px;
}

This allows cards to line up in rows, wrap when there is not enough space, and stay centered inside the container.

Coding Challenge

Use the starter code below and update the CSS to make the card grid responsive. Focus on Flexbox only. Do not use CSS Grid for this challenge.

Requirements

Create a product card layout using Flexbox.
The card container must use display: flex;.
The cards must wrap onto new rows when needed.
Cards must have consistent spacing between them.
The layout must stay centered horizontally.
On screens wider than 1024px, display four cards per row.
On screens from 768px to 1023px, display two cards per row.
On screens narrower than 768px, display one card per row.
The page must remain readable and usable on mobile devices.

Input and Output

Input

This challenge does not require user input. You will write CSS styles for an existing HTML structure.

Output

When opened in a browser, the product cards should automatically rearrange based on the screen width.

Desktop: 4 cards per row
Tablet: 2 cards per row
Mobile: 1 card per row

Constraints

Use Flexbox for the layout.
Do not use CSS Grid.
Do not use external CSS frameworks.
Do not use JavaScript.
Keep the HTML structure unchanged.
Only update the CSS.

Hints

Add display: flex; to the card container.
Add flex-wrap: wrap; so cards can move to the next row.
Use gap to create spacing between cards.
Use justify-content: center; to center the rows.
Use calc() to control the card width while accounting for gaps.
Use media queries to change card widths for tablet and mobile screens.

Starter Code

Copy this starter code into your project. Complete the missing Flexbox styles in styles.css.

<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Responsive Card Grid</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <main>
    <h1>Product Showcase</h1>

    <section class="card-container" aria-label="Product cards">
      <article class="card">
        <h2>Product 1</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 2</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 3</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 4</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 5</h2>
        <p>A short product description goes here.</p>
      </article>

      <article class="card">
        <h2>Product 6</h2>
        <p>A short product description goes here.</p>
      </article>
    </section>
  </main>
</body>
</html>

/* styles.css */
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f9fafb;
  color: #1f2937;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
}

.card-container {
  /* Add Flexbox styles here */
}

.card {
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

Solution Walkthrough

Step 1: Create the flex container

Add display: flex; to .card-container. This makes the cards flex items.

Step 2: Allow wrapping

Add flex-wrap: wrap; so cards can move to the next row when the screen gets smaller.

Step 3: Add spacing and alignment

Use gap for consistent spacing and justify-content: center; to keep the cards centered.

Step 4: Set desktop card widths

Use flex: 0 1 calc(25% - 1.5rem); so four cards fit per row on large screens.

Step 5: Add responsive breakpoints

Use media queries to change the card width to two columns on tablets and one column on mobile screens.

Solution

/* styles.css */
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f9fafb;
  color: #1f2937;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
}

.card-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.card {
  flex: 0 1 calc(25% - 1.5rem);
  box-sizing: border-box;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card h2 {
  margin-top: 0;
}

.card p {
  line-height: 1.6;
}

@media (max-width: 1023px) {
  .card {
    flex-basis: calc(50% - 1.5rem);
  }
}

@media (max-width: 767px) {
  main {
    padding: 1rem;
  }

  .card {
    flex-basis: 100%;
  }
}

Why This Works

Stretch Goals

Add a hover effect that slightly lifts each card.
Add product images and make them responsive.
Add buttons inside each card.
Add a featured card style for one product.
Use CSS variables for colors, spacing, and border radius.
Rebuild the same layout using CSS Grid and compare the difference.

Quick Checklist

Does the container use display: flex;?
Does the container use flex-wrap: wrap;?
Are the cards evenly spaced with gap?
Does the desktop layout show four cards per row?
Does the tablet layout show two cards per row?
Does the mobile layout show one card per row?
Did you avoid using CSS Grid?

Support

Keep CompileQuestHub free

If this challenge helped you, support more open tutorials and code examples.

Support the site Start Here

Need More?

Request a topic or report an issue

Use the contact form to request follow-up tutorials or report broken code, missing files, or outdated links.

Request a topic Report a problem

Page Info

Freshness and topics

Topic: CSS

Difficulty: Beginner

Reading time: 6 min read

Published: 5/22/2026

Updated: 5/26/2026

#CSS #Flexbox #Responsive Design #Web Development

Before You Start

Prerequisites

Basic HTML knowledge
Understanding of CSS selectors

Outcome

What you will learn

Apply Flexbox properties to create flexible layouts
Use media queries to build responsive designs
Control spacing and alignment with gap and justify-content
Develop a mobile-first card grid without CSS Grid

Learning Path

CSS Foundations

Continue this sequence from the series page and move through the lessons in order.

Open series

Keep going with nearby resources

Browse all

5/22/2026

Build an Accessible FAQ Accordion with HTML and CSS

Build an Accessible Tabs Component with HTML, CSS & Vanilla JavaScript Tutorial and Coding Challenge

Challenge Goal

What You Will Build

Concept Overview

Example

Coding Challenge

Requirements

Input and Output

Input

Output

Constraints

Hints

Starter Code

Solution Walkthrough

Step 1: Create the flex container

Step 2: Allow wrapping

Step 3: Add spacing and alignment

Step 4: Set desktop card widths

Step 5: Add responsive breakpoints

Solution

Why This Works

Stretch Goals

Quick Checklist

Keep CompileQuestHub free

Request a topic or report an issue

Freshness and topics

Prerequisites

What you will learn

CSS Foundations

Keep going with nearby resources

Build an Accessible FAQ Accordion with HTML and CSS

Create a Semantic Navigation Bar with HTML

Build a Simple Contact Form Page with HTML

Challenge Goal

What You Will Build

Concept Overview

Example

Coding Challenge

Requirements

Input and Output

Input

Output

Constraints

Hints

Starter Code

Solution Walkthrough

Step 1: Create the flex container

Step 2: Allow wrapping

Step 3: Add spacing and alignment

Step 4: Set desktop card widths

Step 5: Add responsive breakpoints

Solution

Why This Works

Stretch Goals

Quick Checklist

Keep CompileQuestHub free

Request a topic or report an issue

Freshness and topics

Prerequisites

What you will learn

CSS Foundations

Keep going with nearby resources

Build an Accessible FAQ Accordion with HTML and CSS

Create a Semantic Navigation Bar with HTML

Build a Simple Contact Form Page with HTML

Get Clarity Before Work Gets Chaotic

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