Increase GNU Radio World embed height via shared CSS override

[Copilot]

GNU Radio World embeds were rendering shorter than desired across the book. This updates the shared iframe sizing override so all GRW embeds render 50% taller without editing each chapter embed individually.

• What changed

  • Updated the shared iframe[src*="gnuradioworld.com"] rule in _static/custom.css
  • Increased the enforced embed height by adjusting:
    • aspect ratio from 21/9 to 14/9
    • minimum height from 345px to 518px
    • wide-screen height cap from 640px to 960px

• Why this shape

  • Keeps embed sizing centralized in one place
  • Applies consistently to homepage and chapter embeds, including those with inline iframe styles

• Resulting override

  iframe[src*="gnuradioworld.com"] {
    aspect-ratio: 14 / 9 !important;
    min-height: 518px !important;
    max-height: min(90vh, 960px);
  }

• Fixes Make GRW embeds taller #176

[Copilot]

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Copilot review overview

Review effort: Lite
Findings: 1 · 1

Open (2)

• min-height: 518px can exceed the computed max-height on shorter viewports (e.g., 90vh < 518px… · New
• Using vh for height caps can be unreliable on mobile browsers due to dynamic browser chrome… · New

What changed in this PR

Updates the CSS for embedded GNU Radio World iframes to make them taller and to override inline sizing styles consistently across the book.

Changes:

• Replaced the prior “cap height only” approach with explicit aspect-ratio + min-height overrides (using !important to beat inline styles).
• Increased the wide-screen max-height cap by ~50% (from 60vh/640px to 90vh/960px).
• Updated the explanatory comment to reflect the new sizing strategy.

File	Description
_static/​custom.css	Adjusts GNU Radio World iframe sizing (aspect ratio, min-height, and max-height caps) and updates related documentation comment.

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