Module 6: CSS3 Fundamentals

CSS is used to control look and layout. Once HTML structure is ready, CSS makes it beautiful and responsive.

Learning Goals

• Understand selectors and specificity
• Use Box Model and spacing effectively
• Build layouts with Flexbox and Grid
• Apply typography, colors, spacing systems
• Create responsive interfaces with media queries

Concepts in Order

1. Selectors and Cascading
2. Box Model (margin, border, padding, content)
3. Display and Positioning
4. Flexbox Layouts
5. CSS Grid Layouts
6. Responsive Design
7. Transitions and Basic Animations

Mini Practice

Style the page from Module 2:

• Add card layout for skills
• Build responsive navbar
• Create two-column section for desktop and stacked layout for mobile

Next Module

👉 Continue to JavaScript Fundamentals

Common Mistakes

• Overusing !important instead of fixing specificity and cascade strategy
• Mixing layout methods without understanding flow and box model behavior
• Writing desktop-first styles and patching mobile later

Try It Yourself

• Rebuild one section using Flexbox and another using Grid.
• Add one mobile breakpoint and verify layout behavior on narrow screens.

Key Takeaways

• Layout confidence comes from mastering the box model, flow, and spacing.
• Flexbox and Grid solve most modern layout needs when used intentionally.
• Mobile-first responsive design prevents brittle desktop-only styling.