Ciprian Popescu

Modern Design Library is a toolkit of opinionated Gutenberg blocks for WordPress. All optional blocks are registered using PHP-only block registration (<code>autoRegister</code>) — no JavaScript build step or Node.js tooling required.
The plugin ships with:
<ul>
<li>Colored Line — a fully customisable horizontal separator block with striped, shade, and dotted style variants (classic JS-registered block).</li>
<li>Advanced Separator (experimental) — a PHP-only separator with configurable width, height, padding, alignment, and three decorative variants.</li>
<li>Advanced Heading (experimental) — 13 decorative heading styles, heading level selector (H1–H6), optional tagline, and full typography/spacing/border block support controls. Accent decorations automatically follow the text colour.</li>
<li>Marquee (experimental) — a single infinitely scrolling text row. Stack multiple blocks for multi-row layouts. Speed (Slow/Medium/Fast) and direction (Left/Right) are configurable. Animation script is loaded lazily — only on pages containing the block.</li>
<li>Call to Action (experimental) — a CTA banner with heading, subheading, button label/URL, three visual variants (Primary/Secondary/Dark), and native colour overrides.</li>
<li>Author Box (experimental) — displays a user card with avatar, bio, email, and LinkedIn link. User is selected from a dropdown. LinkedIn URL is stored as user meta (set on the user’s profile page).</li>
</ul>
Optional blocks are enabled from Settings → Modern Design Library → Modules.
The optional blocks require the Gutenberg plugin or WordPress 7.0+ for the <code>autoRegister</code> block support.
Read more on <a href="https://getbutterfly.com/wordpress-plugins/modern-design-library-ui/" rel="nofollow ugc">getButterfly</a>.
For a deep dive into how the PHP-only blocks work, read <a href="https://getbutterfly.com/php-only-block-registration-in-wordpress/" rel="nofollow ugc">PHP-Only Block Registration in WordPress 7.0</a>.

Modern Design Library

A Modern Design Library toolkit for blocks: separators, headings, marquees, call-to-action banners, and author boxes.

Daniel Ostman

Separator Widget inserts a horizontal rule ( <code><hr></code> ) or a custom div ( <code><div class="my-separator"></div></code> ) in your widget area. Each widget can be set to one of those options.
No extra styling is added so you are free to style them however you want it. 
Add your custom <code>hr</code> styling to your CSS or use <code>.my-separator</code> if you prefer that option.
Free and easy to use!
<a href="http://www.danielostman.se/" title="Visit WordPress developer web site" rel="nofollow ugc">More info about the WordPress plugin developer</a>

Separator Widget

A widget that inserts a horizontal rule or a custom div.

Modern Design Library vs Separator Widget