CSS border-top-style Property - Lena Design
css - How to square the sides of top-border? - Stack Overflow
CSS | border-top-width Property - GeeksforGeeks
html - Create linear gradient border for top and bottom edges only? - Stack Overflow
CSS border-top-width Property - server2client.com
CSS border-top-style Property - server2client.com
CSS | border-top-color Property - GeeksforGeeks
border-top-right-radius - CSS: Cascading Style Sheets | MDN
CSS Border Property in HTML: Part 2
CSS | border-top-right-radius Property - GeeksforGeeks
Mastering CSS Border Style: A Comprehensive Guide | LambdaTest
ボックスモデルを極めるためのCSSプロパティ、10選：D89 CSS/スタイルシート リファレンス辞典（4） - ＠IT
CSS border-radius complete property guide | Rounded Corners
43 CSS Borders
CSS box model - Wikipedia
CSS border-top-style property - Studytonight
CSS | border-top-color Property - GeeksforGeeks
CSS border-top-color Property
border-top-right-radius | Codrops
CSS border-top-style Property
Bounds
Box rendering type
