How do I add CSS to converted Markdown HTML?

Wrap the HTML in a container with a class and target that class in a stylesheet, or add a block to the downloaded full document. For email, inline the styles instead.

Why is the HTML output unstyled?

The converter returns semantic markup without opinions about design so it fits any site. You add typography and spacing with your own CSS.

What is a good default style for an article?

A max-width around 680px, a system font stack, and a line height near 1.6 give readable long-form text. Style blockquotes, code, and tables to match your brand.

Markdown to HTML guide

Markdown to HTML With Inline CSS and Styling

Convert Markdown to HTML and wrap it in styles — inline CSS or a stylesheet — so the exported page looks designed, not raw.

Direct answer

Convert the Markdown to HTML, then style it either by wrapping the output in a container with a stylesheet or by adding inline style attributes. For a self-contained page, use the full-document download and add a <style> block; for embedding, wrap the fragment in a styled parent element.

Open Markdown to HTML converter

When to use this

The raw converted HTML looks unstyled and you want a designed page.
You need a self-contained HTML file with its own CSS.
You are embedding the HTML in a page that needs scoped styles.

Steps

Convert your Markdown to HTML.
Decide on delivery: a standalone page (use a <style> block) or an embed (use a wrapper class).
For a standalone page, download the full document and add a <style> block in the head.
For an embed, wrap the fragment in a <div class="prose"> or add inline style attributes.
Set base typography — font family, line height, max width — so long text stays readable.

Example conversion

Markdown input

# Styled article

This paragraph will inherit whatever CSS wraps it.

> A blockquote to style with a left border.

HTML output

<style>
  .prose { max-width: 680px; margin: 0 auto; font: 16px/1.6 system-ui, sans-serif; }
  .prose blockquote { border-left: 4px solid #6366f1; padding-left: 1rem; color: #555; }
</style>
<div class="prose">
  <h1>Styled article</h1>
  <p>This paragraph will inherit whatever CSS wraps it.</p>
  <blockquote>A blockquote to style with a left border.</blockquote>
</div>

Common mistakes

The converter outputs an unstyled fragment on purpose; styling is a separate step you add around it.
For email, a <style> block is unreliable — inline the CSS instead (see the HTML email guide).
Do not over-constrain width on mobile; use max-width plus a percentage width so the layout stays responsive.

FAQ

How do I add CSS to converted Markdown HTML?: Wrap the HTML in a container with a class and target that class in a stylesheet, or add a <style> block to the downloaded full document. For email, inline the styles instead.
Why is the HTML output unstyled?: The converter returns semantic markup without opinions about design so it fits any site. You add typography and spacing with your own CSS.
What is a good default style for an article?: A max-width around 680px, a system font stack, and a line height near 1.6 give readable long-form text. Style blockquotes, code, and tables to match your brand.

Related Markdown to HTML guides

How to Convert Markdown to HTML

Convert Markdown into clean, semantic HTML — headings, paragraphs, lists, links, and emphasis — ready to paste into a page or CMS.

Convert a README to an HTML Page

Turn a README.md into a standalone HTML page you can host, preview, or embed — headings, code blocks, and tables intact.

Markdown to HTML for Email Newsletters

Convert Markdown into HTML for email newsletters, then inline the styles so it renders in Gmail, Outlook, and Apple Mail.

Convert a Markdown Table to an HTML Table

Turn a Markdown pipe table into a full HTML <table> with thead, tbody, and alignment preserved.

Embed HTML in Markdown (and When to Mix Them)

Use raw HTML inside Markdown for things Markdown can't express — collapsible sections, keyboard keys, subscript — and know when not to.

Markdown to HTML: CLI vs Online Converter

When to use a command-line tool like pandoc or markdown-it versus a fast, no-login online Markdown to HTML converter.

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