CSS3
- https://www.w3schools.com/default.asp - W3S Website
- https://jigsaw.w3.org/css-validator/#validate_by_upload - CSS Validator Website
HTML
- https://validator.w3.org/#validate_by_upload - HTML Validator Website
- https://achecker.ca/checker/index.php - HTML Accessibility Website
Animations
- https://www.w3schools.com/css/css3_animations.asp - CSS Animations
Transitions
- https://www.w3schools.com/css/css3_transitions.asp - CSS Transitions
Desgin Guidelines
- https://learning.oreilly.com/library/view/the-non-designers-design/9780133966350/ - Non-Designer's Book