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What is CSS - Hands-On Activity

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What is CSS
📖 Scenario: You want to make a simple webpage look nicer by changing colors and text style. CSS helps you do that.
🎯 Goal: Learn how to write basic CSS to change the color and font of a heading on a webpage.
📋 What You'll Learn
Create a CSS rule to change the color of a heading
Change the font style of the heading
Use a CSS selector to target the heading element
💡 Why This Matters
🌍 Real World
Web designers use CSS to make websites look attractive and easy to read.
💼 Career
Knowing CSS is essential for front-end web development jobs to create visually appealing websites.
Progress0 / 4 steps
1
Create a heading in HTML
Write an HTML heading <h1> with the text Welcome to CSS inside the <body> tag.
CSS
Hint

Use the <h1> tag inside the <body> to add a big heading.

2
Add a CSS style block
Inside the <head> tag, add a <style> block where you will write CSS rules.
CSS
Hint

The <style> tag goes inside <head> to hold CSS code.

3
Write a CSS rule to change heading color
Inside the <style> block, write a CSS rule that changes the color of the h1 heading to blue.
CSS
Hint

Use the selector h1 and set color: blue; inside curly braces.

4
Add font style to the heading
In the same CSS rule for h1, add a property to change the font family to Arial, sans-serif.
CSS
Hint

Add font-family: Arial, sans-serif; inside the h1 CSS rule.

Practice

(1/5)
1. What is the main purpose of CSS in web development?
easy
A. To control the appearance and layout of web pages
B. To add interactive behavior to web pages
C. To store data in a database
D. To write the content of a web page

Solution

  1. Step 1: Understand CSS role

    CSS is used to style and arrange how elements look on a webpage.

  2. Step 2: Compare with other web technologies

    JavaScript adds behavior, HTML adds content, CSS controls style and layout.

  3. Final Answer:

    To control the appearance and layout of web pages -> Option A

  4. Quick Check:

    CSS = style and layout [OK]
Hint: Remember: CSS = style, HTML = content, JS = behavior [OK]
Common Mistakes:
  • Confusing CSS with JavaScript
  • Thinking CSS stores data
  • Mixing CSS with HTML content
2. Which of the following is the correct way to write a CSS rule to make text red?
easy
A. color = red;
B. text-color = red;
C. font-color: red;
D. color: red;

Solution

  1. Step 1: Identify correct CSS property syntax

    The correct property to change text color is 'color' followed by a colon and value, ending with a semicolon.

  2. Step 2: Check each option's syntax

    color: red; uses correct syntax: 'color: red;'. Others use wrong property names or assignment operators.

  3. Final Answer:

    color: red; -> Option D

  4. Quick Check:

    CSS property syntax uses colon and semicolon [OK]
Hint: CSS uses colon ':' not equal '=' for properties [OK]
Common Mistakes:
  • Using '=' instead of ':'
  • Wrong property names like 'font-color'
  • Missing semicolon at end
3. Given this CSS code:
p { font-size: 1.5rem; color: blue; }

What will happen to all <p> elements on the page?
medium
A. They will have red text
B. They will be hidden from the page
C. They will have larger blue text
D. They will have smaller black text

Solution

  1. Step 1: Analyze the CSS properties

    The rule sets font size to 1.5rem (larger than default) and text color to blue for all <p> elements.

  2. Step 2: Understand the effect on <p> elements

    All paragraphs will show bigger text in blue color.

  3. Final Answer:

    They will have larger blue text -> Option C

  4. Quick Check:

    font-size 1.5rem + color blue = bigger blue text [OK]
Hint: font-size and color control text look [OK]
Common Mistakes:
  • Confusing color blue with red
  • Thinking font-size 1.5rem is smaller
  • Assuming elements are hidden
4. Look at this CSS snippet:
div { background-color: #ff000; }

What is wrong with this code?
medium
A. The property name is incorrect
B. The color code is missing one digit
C. Background color cannot use hex codes
D. There is no semicolon at the end

Solution

  1. Step 1: Check the hex color code format

    Hex color codes must have 3 or 6 hexadecimal digits after '#'. '#ff000' has only 5 digits, which is invalid.

  2. Step 2: Verify property name and syntax

    'background-color' is correct and semicolon is present, so no error there.

  3. Final Answer:

    The color code is missing one digit -> Option B

  4. Quick Check:

    Hex colors need 3 or 6 digits [OK]
Hint: Hex colors must be 3 or 6 digits after # [OK]
Common Mistakes:
  • Using incomplete hex codes
  • Thinking property name is wrong
  • Missing semicolon errors
5. You want to make a website text easy to read on small screens. Which CSS approach helps achieve this?
hard
A. Use relative font sizes like rem and add media queries
B. Set all font sizes in pixels and avoid media queries
C. Use only fixed width containers without flexible layout
D. Apply background images to text elements

Solution

  1. Step 1: Understand responsive design basics

    Using relative units like rem allows text to scale with user settings and screen size.

  2. Step 2: Use media queries for screen size adjustments

    Media queries let you change styles for small screens, improving readability.

  3. Final Answer:

    Use relative font sizes like rem and add media queries -> Option A

  4. Quick Check:

    Relative sizes + media queries = responsive text [OK]
Hint: Combine rem units with media queries for responsive text [OK]
Common Mistakes:
  • Using fixed pixel sizes only
  • Ignoring media queries
  • Adding background images to text