Responsive Design

Learn how to create flexible layouts that adapt seamlessly to different screen sizes and devices.

What You’ll Learn

• Responsive design principles
• Mobile-first approach
• Breakpoints and media queries
• Flexible grids and layouts
• Responsive images and media
• Performance optimization

Core Concepts

Mobile-First Design

Starting with mobile:

• Forces content prioritization
• Improves performance
• Ensures essential functionality
• Simplifies progressive enhancement

Fluid Grids

Creating flexible layouts:

• Relative units (%, em, rem)
• CSS Grid
• Flexbox
• Container queries

Implementation Techniques

Media Queries

/* Example media queries */
@media (min-width: 640px) {
  /* Small devices */
}

@media (min-width: 768px) {
  /* Medium devices */
}

@media (min-width: 1024px) {
  /* Large devices */
}

Responsive Images

<picture>
  <source media="(min-width: 800px)" srcset="large.jpg">
  <source media="(min-width: 400px)" srcset="medium.jpg">
  <img src="small.jpg" alt="Responsive image">
</picture>

Best Practices

1. Test across multiple devices
2. Optimize performance
3. Consider touch interfaces
4. Maintain accessibility
5. Use appropriate breakpoints

Common Patterns

• Navigation menus
• Image galleries
• Data tables
• Forms
• Typography

Remember: Responsive design is about creating a seamless experience across all devices, not just making things fit different screens.