css - Drop down menu disappears too quicky - Stack Overflow
html - How to make a pure css based dropdown menu? - Stack Overflow
How do negative margins in CSS work and why is (margin-top:-5 != margin-bottom:5)? - Stack Overflow
Box model
padding-block | CSS-Tricks - CSS-Tricks
CSS Padding | A Comprehensive Guide to CSS Padding
Getting Down with CSS
CSS Margin Color | Understanding of Different CSS Margin Color
CSS Padding
padding-bottom | Codrops
How to Style Drop Down Menus - CSS Web Design Tutorial - YouTube
Box model
How To Adjust the Content, Padding, Border, and Margins of an HTML Element With CSS | DigitalOcean
css-battle-answer/Ups-n-Downs.md at master · chokcoco/css-battle-answer · GitHub
Line-by-line: advanced CSS tricks for click-to-open drop-down lists and menus
Awesome CSS Select Styles You Can Use Right Now
CSS Box Model. Margin, padding, border, content… If… | by Yiğit Atak | CodeX | Medium
How to Create a Custom Select Dropdown using HTML, CSS and JavaScript
Dropdown Default Styling | CSS-Tricks - CSS-Tricks
How to Understand and Work With CSS Margins
