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How to Change Opacity Using CSS

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The opacity property accepts a numeric value from 0 to 1, allowing you to control the opacity of an element.

html
1<div></div>
css
1div {
2  width: 300px;
3  height: 400px;
4  background-image: url(. . .);
5  background-size: cover;
6
7  opacity: 0.5;
8}
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📚 Course Outline
  • 1. Fundamentals of Web Development
  • 1. Preparations
  • 2. HTML Elements
  • 3. Query Selectors
  • 4. Colors
  • 5. Text Customization
  • 6. Text Spacing & Alignment
  • 7. Loading Fonts
  • 8. Font Customizations
  • 9. Typography
  • 10. Functions
  • 11. The @ Rules
  • 12. Links
  • 13. Lists
  • 14. Tables
  • 15. Forms
  • 16. Media Files
  • 17. The Box Model
  • 18. Display Types
  • 19. Overflow
  • 20. Object Fit
  • 21. Aspect Ratio
  • 22. Float
  • 23. Position
  • 24. The Column Layout
  • 25. The Grid Layout
  • 26. The Flexbox Layout
  • 27. Justify & Align
  • 28. Z index
  • 29. Visibility
  • 30. Visibility vs. Opacity vs. Hidden
  • 31. Box Shadow
  • 32. Backgrounds
  • 33. Gradient
  • 34. Opacity
  • 35. Blend Modes
  • 36. Filters
  • 37. Transforms
  • 38. Transitions
  • 39. Animations
  • 40. Cursor Customizations
  • 41. Scroll Behavior
  • 42. Units
  • 43. Responsive Design
  • 44. Responsive Media
  • 45. Responsive Text
  • 46. Responsive Layout
  • 47. Organizing CSS
  • 48. Best Practices
  • 49. TailwindCSS
  • 50. Project #1: Recreating YouTube
  • 51. Project #2: Building a Calculator
  • 1. Introduction
  • 2. Setting Up a Dev Environment
  • 3. Basic Syntax
  • 4. Data Types
  • 5. Numbers & BigInt
  • 6. Strings
  • 7. Boolean Values
  • 8. Undefined & Null
  • 9. Type Conversion
  • 10. Arrays
  • 11. Objects
  • 12. Maps & Sets
  • 13. If Statements
  • 14. Switch Statements
  • 15. While Loops
  • 16. For Loops
  • 17. Functions
  • 18. Variables & Scope
  • 19. Rest Parameter & Spread Syntax
  • 20. Pure Functions
  • 21. Higher Order Functions
  • 22. Recursion
  • 23. Methods
  • 24. Constructor Functions
  • 25. Getters & Setters
  • 26. Prototypes
  • 27. The Class Notation
  • 28. Class Inheritance
  • 29. Static Properties
  • 30. Private Properties
  • 31. Object Oriented Programming
  • 32. Error Handling
  • 33. Asynchronous Programming
  • 34. Promise
  • 35. Async & Wait
  • 36. JavaScript Modules
  • 37. The DOM Tree
  • 38. Manipulation the DOM
  • 39. Event Handling
  • 40. Some Common Events
  • 41. Canvas
  • 42. Project #3: Building an Image Slider
  • 43. Project #4: Building a Drawing Board
  • 44. Working with Date
  • 45. The Math Object
  • 46. JSON
  • 47. Regular Expressions
  • 48. Define Patterns with Regex
  • 49. Regex Related Methods
  • 50. Project #5: Building a Calculator
  • 51. Network & HTTP
  • 52. A Basic Web App
  • 53. Express.js
  • 54. Model Layer
  • 55. View Layer
  • 56. Controller Layer
  • 57. Form Handling
  • 58. Uploading Files
  • 59. Project #6: Building a Blog System
  • 60. Loading Static Files
  • 61. Prisma Integration
  • 62. Adding Relations
  • 63. Middleware
  • 64. Browser Data Storage
  • 65. User Authentication
  • 1. Optimize Your Web App
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