When building websites with dynamic content filters, portfolio galleries, or category clouds, you often need to display items in a specific logical order rather than alphabetical. This guide shows you how to use CSS Flexbox to create custom ordering for any type of filter system.
Why Custom Ordering Matters
Default filter systems typically display categories alphabetically or by creation date. However, for professional websites, you might need:
Logical grouping: Related items together (e.g., musical instruments by family)
Hierarchical ordering: Most important categories first
Professional presentation: Following industry standards or conventions
User experience: Intuitive navigation that matches user expectations
Step 1: Inspect and Extract the HTML Structure
The first crucial step is understanding your website’s HTML structure. Here’s how to properly inspect and copy the relevant code:
Using Browser Developer Tools
1. Right-click on any filter button or category link
2. Select “Inspect Element” (Chrome/Firefox) or “Inspect” (Safari)
3. Locate the container element that holds all filters
4. Right-click on the container element in the developer tools
5. Select “Copy” → “Copy outerHTML”
What to Look For
You need to identify these key elements:
Container element: The parent that holds all filter items
Individual filter elements: Each clickable filter/category
Unique identifiers: Classes, IDs, or data attributes that distinguish each item
Example HTML Structures
Portfolio Filters (Elementor)
<ul class="elementor-portfolio__filters">
<li class="elementor-portfolio__filter elementor-active" data-filter="__all">All</li>
<li class="elementor-portfolio__filter" data-filter="112">Category A</li>
<li class="elementor-portfolio__filter" data-filter="113">Category B</li>
<!-- More filters... -->
</ul>
Tag Clouds (WordPress)
<div class="tagcloud">
<a href="/category/acf/" class="tag-cloud-link tag-link-41">ACF</a>
<a href="/category/ai/" class="tag-cloud-link tag-link-20">AI assistants</a>
<a href="/category/tools/" class="tag-cloud-link tag-link-38">Tools</a>
<!-- More tags... -->
</div>
Custom Filter Lists
<div class="filter-container">
<button class="filter-btn" data-category="design">Design</button>
<button class="filter-btn" data-category="development">Development</button>
<button class="filter-btn" data-category="marketing">Marketing</button>
<!-- More buttons... -->
</div>
Step 2: Identify Unique Selectors
Each filter item needs a unique CSS selector. Common patterns include:
- Data attributes:
data-filter="112",data-category="design" - Classes with IDs:
tag-link-41,tag-link-20 - URLs or slugs: Links containing category slugs
- Positional classes:
tag-link-position-1,tag-link-position-2
Step 3: Create CSS Isolation
To prevent your custom ordering from affecting other parts of your website, always use a specific container selector:
Method 1: Add Custom CSS ID
- In your page builder or theme customizer, add a custom CSS ID to the widget/section
- Use that ID as your CSS selector
#my-custom-filters .filter-container {
display: flex;
flex-direction: row;
flex-wrap: wrap;
}
Method 2: Use Existing Specific Selectors
.elementor-widget-posts .elementor-portfolio__filters {
display: flex;
flex-direction: row;
flex-wrap: wrap;
}
Method 3: Page-Specific Targeting
.page-id-123 .tagcloud {
display: flex;
flex-direction: row;
flex-wrap: wrap;
}
Step 4: Implement Flexbox Ordering
Basic CSS Structure
/* 1. Make the container a flex container */
#your-container .filter-list {
display: flex;
flex-direction: row;
flex-wrap: wrap;
}
/* 2. Assign order values to each item */
#your-container .filter-item[data-filter="first"] {
order: 1;
}
#your-container .filter-item[data-filter="second"] {
order: 2;
}
#your-container .filter-item[data-filter="third"] {
order: 3;
}
Real-World Example: Musical Instruments
/* Isolated with custom ID */
#musical-instruments .elementor-portfolio__filters {
display: flex;
flex-direction: row;
flex-wrap: wrap;
}
/* Voices (highest to lowest) */
#musical-instruments .elementor-portfolio__filter[data-filter="112"] {
order: 2; /* Soprano */
}
#musical-instruments .elementor-portfolio__filter[data-filter="113"] {
order: 3; /* Mezzo-soprano */
}
#musical-instruments .elementor-portfolio__filter[data-filter="114"] {
order: 4; /* Alto */
}
/* Keyboard instruments */
#musical-instruments .elementor-portfolio__filter[data-filter="130"] {
order: 10; /* Piano */
}
#musical-instruments .elementor-portfolio__filter[data-filter="136"] {
order: 11; /* Organ */
}
/* String instruments */
#musical-instruments .elementor-portfolio__filter[data-filter="131"] {
order: 20; /* Violin */
}
#musical-instruments .elementor-portfolio__filter[data-filter="104"] {
order: 21; /* Cello */
}
Tag Cloud Ordering Example
/* Target specific page's tag cloud */
.page-about .tagcloud {
display: flex;
flex-direction: row;
flex-wrap: wrap;
gap: 10px;
}
/* Order by importance */
.page-about .tag-link-19 { order: 1; } /* Websites */
.page-about .tag-link-38 { order: 2; } /* Tools */
.page-about .tag-link-8 { order: 3; } /* Plugin */
.page-about .tag-link-26 { order: 4; } /* News */
.page-about .tag-link-31 { order: 5; } /* Elementor */
Step 5: Advanced Ordering Strategies
Grouping Related Items
/* General filters first */
#filters .filter[data-filter="__all"] { order: 1; }
/* Primary categories (1-10) */
#filters .filter[data-filter="primary-a"] { order: 2; }
#filters .filter[data-filter="primary-b"] { order: 3; }
/* Secondary categories (11-20) */
#filters .filter[data-filter="secondary-a"] { order: 11; }
#filters .filter[data-filter="secondary-b"] { order: 12; }
/* Utility categories (21-30) */
#filters .filter[data-filter="utilities-a"] { order: 21; }
#filters .filter[data-filter="utilities-b"] { order: 22; }
Responsive Ordering
/* Desktop order */
@media (min-width: 768px) {
#filters .filter-item { order: var(--desktop-order); }
}
/* Mobile order (different priority) */
@media (max-width: 767px) {
#filters .filter-item { order: var(--mobile-order); }
}
Step 6: Testing and Refinement
Verification Checklist
1. Visual inspection: Check that items appear in the correct order
2. Cross-browser testing: Ensure compatibility across different browsers
3. Responsive testing: Verify ordering works on different screen sizes
4. Functionality testing: Confirm that filters still work correctly
5. Performance check: Ensure CSS doesn’t negatively impact page speed
Common Issues and Solutions
Issue: Items not reordering
Solution: Ensure the parent container has display: flex
Issue: Layout breaking
Solution: Add flex-wrap: wrap and consider adding gap for spacing
Issue: Affecting other elements
Solution: Use more specific CSS selectors or custom IDs
Issue: Order not updating
Solution: Clear browser cache and check for CSS conflicts
Step 7: Implementation in Different Platforms
WordPress with Elementor
1. Edit the widget in Elementor
2. Go to Advanced → CSS ID
3. Add your custom ID (e.g., “ordered-filters”)
4. Add CSS to Customizer → Additional CSS
Pure WordPress Theme
1. Add CSS to your theme’s style.css or via Customizer
2. Use page-specific or widget-specific selectors
3. Consider using wp_add_inline_style() for dynamic CSS
Other CMSs
1. Identify the theme’s CSS customization area
2. Use browser developer tools to find specific selectors
3. Add your custom CSS following the same principles
Best Practices
Performance Optimization
• Use specific selectors to minimize CSS processing
• Group related order rules together
• Avoid overly complex selectors
Maintainability
• Comment your CSS with clear category names
• Use consistent order numbering (gaps of 10 for future insertions)
• Document the ordering logic for future reference
Accessibility
• Ensure logical tab order still works after CSS reordering
• Test with screen readers to verify navigation remains intuitive
• Consider using aria-label attributes for better accessibility
Future-Proofing
• Leave gaps in your order numbering for future additions
• Use CSS custom properties for easier maintenance
• Consider creating a standardized ordering system for similar elements
Conclusion
Custom CSS ordering transforms random or alphabetical filter displays into logical, professional navigation systems. By understanding HTML structure, using proper CSS isolation, and implementing Flexbox ordering strategically, you can create intuitive user experiences that match your content’s natural hierarchy.
The key is careful inspection of your existing HTML structure, precise targeting with CSS selectors, and systematic implementation of the order property within a Flexbox container. This approach works across different platforms and can be adapted to virtually any filter or category system.
