Border Bottom should touch the two extreme sides of the walls overcoming margin gaps - HTML & CSS - SitePoint Forums | Web Development & Design Community
Bounds
Define Your Web Pages with CSS Borders: An In-Depth Guide | by Coding Cossack | Medium
border-right-style | Codrops
CSS border-bottom-color Property
html - Text border-bottom issue - Stack Overflow
Mastering CSS Border Style: A Comprehensive Guide | LambdaTest