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MDN guide to CSS Box Model.

Block/inline boxes.

Alternative box model (box-sizing: border-box).

Make a menu that responds to the page width.

https://codepen.io/mortona42/pen/JjgdeoR

Create components and styles with HTML and CSS.

Component Driven

HTML and CSS code has the potential to get tangled...

Media queries let you define styles for different browser sizes.

Sites that work well on mobile devices and desktop displays.

Mobile First

This is a common strategy designers and...

Making sites work on desktop, tablet, and mobile.