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CSS 背景：多彩背景

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About This Exercise

在这个实验中，你将学习 CSS 背景属性，创建丰富的视觉效果。

背景是页面设计的基础，掌握背景属性能让设计更加专业。

你将学到：

  • 使用 background-image 设置背景图
  • 使用 background-size 控制尺寸
  • 使用 background-position 定位背景
  • 创建多层背景效果
Intermediate⏱ 20-25 min

Learning Objectives

  • 掌握背景图片的使用
  • 理解 cover 和 contain 的区别
  • 学会创建多层背景
  • 了解背景简写语法

Scenario

你正在为一个产品设计着陆页。 需要实现： - Hero 区域的全屏背景 - 带有渐变叠加的图片背景 - 装饰性的多层背景效果

Why Do This

  • CSS is fundamentally about constraining layout and visual hierarchy, not memorizing properties.
  • Clarify the box model and layout rules first, then add visual polish — less rework that way.
  • Writing styles as reusable patterns is more valuable than tweaking a single page.

Hands-on Practice

  • Write the layout skeleton first (display/gap/align), then add colors and shadows.
  • Extract repeated styles into reusable classes.
  • Use validation rules to reverse-engineer the design intent of your current styles.

Common Mistakes

  • Adding margin after margin to fix positioning while ignoring layout containers.
  • Selectors nested too deep, causing style coupling.
  • Only caring about how it looks without considering maintainability.

Deliverable

A reusable component style template (layout rules + visual rules + naming conventions).

My Progress

Completed Steps0 / 4
Total Attempts0
Best Score0%

Completion Criteria (Checkable)

Confirm before completing this Lab

Reflection Questions (Recommended)

What was your main layout decision? Why did you choose it?

What change did you make specifically for maintainability?

What would you prioritize improving next time?

Tags

CSS3BackgroundsImagesDesign