CSS Integration — Complete Guide
CSS Integration — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of HTML Tutorial on Toolliyo Academy.
On this page
HTML Tutorial · Lesson 61 of 100
CSS Integration
Basics ✓ → Forms & semantics ✓ → APIs & performance → Projects
APIs & performance · 3 — HTML5, CSS/JS, security · ~10 min · HTML — with CSS & JavaScript
What is this?
HTML links stylesheets and scopes classes/ids that CSS selectors target.
Why should you care?
MarkupVerse themes share one HTML shell with swapped CSS tokens.
See it live — copy this example
Save as demo.html and open in your browser, or use Run Example below.
<link rel="stylesheet" href="/themes/markupverse-banking.css">
<header class="mv-header mv-header--banking">
<span class="mv-logo">MarkupVerse</span>
<nav class="mv-nav" aria-label="Primary">
<a class="mv-nav__link mv-nav__link--active" href="/accounts">Accounts</a>
</nav>
</header>Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- Classes describe hooks, not appearance names like .redText.
- BEM-style blocks keep CSS predictable.
Practice next
- Link an external stylesheet.
- Use BEM-like class names.
- Mark active nav with a modifier class.
- Add a dark theme class on html.
- Swap href to saas.css.
Remember
link rel=stylesheet. Semantic class hooks. Modifiers for state.
MarkupVerse banking skin
Same header HTML, different CSS file.
Outcome: Banking blue vs SaaS purple with one markup file.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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