Box-header has double borders · Issue #685 · primer/css · GitHub
Creating Non-Rectangular Headers | CSS-Tricks - CSS-Tricks
CSS basic box model
css - box-shadow is not getting applied for table header - Stack Overflow
2 Column CSS Layout: Fixed Width And Centered - Vanseo Design
javascript - Variable content div height using css with fixed header and footer - Stack Overflow
Styling a search box inside a header with CSS - Stack Overflow
Wikidot Design & Development - CSS on Wikidot
Box model
Scooped Corners in 2018 | CSS-Tricks - CSS-Tricks
ActionBotのカスタムスタイル（CSS）の変更方法 - WalkMe Support
初心者向け！HTML/CSSのコーディング手順をイチからしっかりと。 | Webクリエイターボックス
How To Adjust the Content, Padding, Border, and Margins of an HTML Element With CSS | DigitalOcean
CSS Box with header - Stack Overflow
CSS to add lines to both sides of header on flipbox | Community
Add a date header ribbon - CSS Cookbook
Scalable Content Box Using Only One Background Image
How to increase the size of a WordPress header image in custom CSS - Quora
Make the Divi Theme Options Header Sticky - Divi Booster
How do I make this box in CSS (please see my image)? - Stack Overflow
Rearranging Boxes — Why You Should Structure Your HTML To Be Flexible - Vanseo Design
