Using Modern CSS to Build a Responsive Image Grid

This article explores techniques for mastering the spacing between columns in responsive grid layouts, using a responsive image gallery as a practical example.

For further insights into responsive layouts, view our screencast: Creating Multiple Column Layouts in Flexbox.

Key Takeaways:

• Custom responsive layouts are achievable by precisely controlling inter-column spacing, as demonstrated with the responsive image gallery.
• The display: inline-block method creates responsive image galleries; setting the parent's font size to zero removes default inline-block spacing.
• Flexbox efficiently solves common layout issues, creating equal-height columns across all screen sizes, simplifying inter-column spacing control in responsive image grids.
• Media queries and CSS Grid layouts enable responsive image grids, applying different CSS rules based on device characteristics (screen size).

Building a Responsive Layout:

On larger screens, the gallery resembles this:

On smaller screens:

The simple markup:

<div>
  <a href="https://www.php.cn/link/14d2bc475177e1dde633b4ca1972d53c">
    <img src="/static/imghw/default1.png"  data-src="https://img.php.cn/"  class="lazy" alt="Using Modern CSS to Build a Responsive Image Grid " />
  </a>
  <!-- ...more images... -->
</div>

Several layout methods achieve this. Before exploring two, let's reiterate the requirements:

• Two-column layout on medium and smaller screens.
• 8px inter-column spacing.

Using inline-block:

The display: inline-block method builds the gallery. Consider this CSS:

div {
  font-size: 0;
}

a {
  font-size: 16px;
  display: inline-block;
  margin-bottom: 8px;
  width: calc(50% - 4px);
  margin-right: 8px;
}

a:nth-of-type(2n) {
  margin-right: 0;
}

@media screen and (min-width: 50em) {
  a {
    width: calc(25% - 6px);
  }

  a:nth-of-type(2n) {
    margin-right: 8px;
  }

  a:nth-of-type(4n) {
    margin-right: 0;
  }
}

Explanation:

Default inline-block spacing is overridden by setting the parent's font size to zero. Child element font sizes may need resetting (not here).

Small screens have a two-column layout with 8px spacing. Column width calculation:

• Total inter-column space per row: 1 * 8px = 8px (8px, not 16px, because the right margin is removed from every second column).
• Column width: calc(50% - 4px) (4px = 8px / 2).

Large screens have a four-column layout with 8px spacing. Column width calculation:

• Total inter-column space per row: 3 * 8px = 24px (24px, not 32px, because the right margin is removed from every fourth column).
• Column width: calc(25% - 6px) (6px = 24px / 4).

See the CodePen demo for the inline-block method.

Using Flexbox:

The inline-block solution has drawbacks. Adding captions demonstrates one:

Updated markup:

<div>
  <a href="https://www.php.cn/link/14d2bc475177e1dde633b4ca1972d53c">
    <img src="/static/imghw/default1.png"  data-src="https://img.php.cn/"  class="lazy" alt="Using Modern CSS to Build a Responsive Image Grid " />
  </a>
  <!-- ...more images... -->
</div>

Large screen gallery with captions:

Unequal heights are resolved with Flexbox. Update the parent element's CSS:

div {
  font-size: 0;
}

a {
  font-size: 16px;
  display: inline-block;
  margin-bottom: 8px;
  width: calc(50% - 4px);
  margin-right: 8px;
}

a:nth-of-type(2n) {
  margin-right: 0;
}

@media screen and (min-width: 50em) {
  a {
    width: calc(25% - 6px);
  }

  a:nth-of-type(2n) {
    margin-right: 8px;
  }

  a:nth-of-type(4n) {
    margin-right: 0;
  }
}

The result is equal-height columns across all screens. Large screen example:

See the CodePen demo using Flexbox with improved captions.

Flexbox's justify-content property doesn't directly create this layout. space-between and space-around result in awkward distribution on the last row. CSS:

<div>
  <a href="https://www.php.cn/link/14d2bc475177e1dde633b4ca1972d53c">
    <img src="/static/imghw/default1.png"  data-src="https://img.php.cn/"  class="lazy" alt="Using Modern CSS to Build a Responsive Image Grid " />
    <figcaption>Some text here</figcaption>
  </a>
  <!-- ...more images... -->
</div>

No margin-right is needed; justify-content handles item distribution.

See the CodePen demo using the justify-content property.

Conclusion:

This post details techniques for controlling inter-column spacing in responsive image grids. While inline-block suffices, Flexbox is easier and more convenient, especially with calc().

Learn more about Flexbox layouts in our screencast: Creating Multiple Column Layouts in Flexbox.

(FAQs section omitted for brevity, as it's a repetition of common responsive design questions.)

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