Without a style guide, design decisions on a WordPress site happen randomly. You pick a colour for a button during setup, choose a slightly different shade for a new page three months later, and by the time you notice the inconsistency, fixing it takes longer than it would have taken to avoid it.
This is one of the most common patterns on self-built WordPress sites. The homepage looks polished, but blog posts use different heading sizes, buttons don’t match across pages, and spacing feels uneven throughout. None of it breaks the site — it just makes everything look less intentional.
A style guide solves this. For most WordPress sites, it doesn’t need to be a formal design document — a private page with a few clearly defined sections is enough. It’s one of the early steps I’d include in the step-by-step process of building a WordPress website, and it pays for the time it takes within the first few months.
What a Website Style Guide Is
A style guide is a reference document that records your design decisions — colour palette, fonts, button styles, image treatment, and content layout rules — so every future decision is consistent with what’s already on the site. It’s the document you check before making any visual change, and the document you share with anyone else who works on your site.
For a new WordPress site, you don’t need a style guide for every possible element. Start with the decisions that affect everything: colours, typography, and buttons. You can add to it as the site grows.
Why Style Guides Matter
Without a written reference, your site drifts. You remember choosing #3B82F6 for your primary button but can’t recall it exactly, so you use #4B91F7 on a new page. Side by side they look wrong, but in isolation they seemed fine. This compounds: more colours, more font weight variations, more inconsistent spacing — until fixing it properly requires touching every page.
Style guides also matter when anyone else touches your site. A developer, a virtual assistant, or a freelance designer making changes without a reference will make their own judgement calls. A style guide turns “I tried to match the existing design” into “I followed the documented rules.”
How to Create a Website Style Guide
1. Define Your Colour Palette
Most WordPress sites need no more than three colours:
- Primary: used for buttons, links, and key highlights
- Secondary: used for supporting elements, borders, or section backgrounds
- Neutral: your main text colour and background colour
Write down the exact hex codes. Not “a warm yellow” — the exact value, like #FFD700. If your theme uses CSS custom properties or a colour palette editor, copy the values from there. Every shade you add beyond three is a shade you’ll have to manage consistently across the entire site.
If you’re still deciding on colours, choosing website colours and fonts walks through how to make those decisions before you document them.
2. Choose and Document Your Typography
Typography is where inconsistency is hardest to spot and easiest to introduce. Document the following:
- Heading font: family name, weight, style (e.g. “Inter, 700, Normal”)
- Body font: family name, weight, style (e.g. “Inter, 400, Normal”)
- Font sizes: your H1, H2, H3, and body text sizes in pixels or rem
If you’re using web fonts from Google Fonts, copy the exact family name as listed there — this prevents slight naming variations from loading a different font weight than intended. Record both the display name and the embed URL you’re using so you can replicate the setup if you ever change themes.
3. Document Button and Link Styles
Buttons are the most frequently inconsistent element on self-built WordPress sites. For each button style you use, record:
- Background colour and hover colour
- Text colour, font weight, and font size
- Border radius (how rounded the corners are) and padding
For text links, note your default link colour and hover colour. These are usually set in your theme’s colour settings but are worth documenting so you know what to match when you add custom elements.
4. Establish Image Rules
Images are a major source of inconsistency on sites that haven’t defined a style. Decide and document:
- Featured image ratio: the aspect ratio your theme expects, such as 16:9 or 3:2
- Image style: photography, illustration, flat icons, or mixed — and whether images are full colour or consistent in tone
- Caption format: whether you use captions and what style they follow
For guidance on selecting the right images in the first place, choosing website images and visuals covers the decisions that belong in your style guide’s image section.
5. Record Content Layout Rules
Layout rules govern how content is structured on the page. For blog posts, this includes how you handle numbered steps — whether you use ordered lists or numbered H3 headings, whether you use a callout box for key tips, and whether you end every post with a conclusion heading. For more on building consistent post structure, designing a blog post template in WordPress goes into the specifics.
Note any recurring layout patterns for pages too: how your services are presented, whether you use full-width sections or a contained layout, and how sidebars or widgets are used.
6. Publish It as a Private WordPress Page
Go to Pages → Add New, create a page titled “Style Guide” or “Brand Reference”, and set the visibility to Private (under Page → Visibility in the block editor sidebar). This keeps it out of search results and navigation while keeping it accessible from your dashboard.
Document each section with the information above. For colours, paste in the hex codes. For fonts, write out the family, weight, and size information in a code block so it’s easy to copy when needed. Keep it plain and functional — this page is a reference tool, not a designed page.
Update it whenever you make a deliberate design change. If you update your primary colour, update the style guide at the same time.
Practical Tips
Create the style guide before you finish building, not after. Documenting design choices as you make them is far easier than reconstructing them from a finished site.
A minimal style guide covering only colours, fonts, and buttons is more useful than a comprehensive one you never finish. Get the core three documented, then expand it as the need arises.
In most sites I build, I also note any colours used specifically for the header background, footer, or widget areas — these are often different from the main palette and cause inconsistency if they’re not recorded separately.
Common Mistakes
Using too many colours. A third accent colour often becomes a fourth, and a fifth. Each addition is another value to manage consistently across the whole site. Limit yourself to three and justify any additions.
Recording colours by name instead of hex value. “Dark blue” is too vague. #1E3A5F is exact. Names drift; hex codes don’t.
Treating it as finished. Style guides go out of date if you don’t maintain them. Set a rule: when you make a deliberate design change on the site, update the guide in the same session.
Skipping it for a simple site. Even a three-page website benefits from documented hex codes and font choices. Simplicity doesn’t reduce the need for consistency — it makes inconsistency more visible.
Style Guide vs Design System
A style guide documents your existing choices. A design system goes further — it defines reusable components, usage rules, and governance for creating new UI patterns. Design systems are used by product teams and larger organisations with multiple designers and developers working on the same codebase.
For a WordPress site you manage yourself, a style guide is what you need. A design system would be overkill and would take longer to maintain than the site itself. If you reach the point where multiple people are regularly making design decisions independently, revisit this distinction.
Conclusion
Create a private WordPress page, document your colour palette, typography, and button styles, and treat it as the reference you check before making any design decision. Three colours, two fonts, one button style — documented precisely — is enough to keep a WordPress site looking consistent long after launch.
Etienne Basson works with website systems, SEO-driven site architecture, and technical implementation. He writes practical guides on building, structuring, and optimizing websites for long-term growth.