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Intro to Computingfundamentals~20 mins

CSS for styling web pages in Intro to Computing - Practice Problems & Coding Challenges

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Challenge - 5 Problems
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🧠 Conceptual
intermediate
2:00remaining
Understanding CSS Box Model

Which part of the CSS box model is responsible for the space between the content and the border?

APadding
BMargin
CBorder
DContent
Attempts:
2 left
💡 Hint

Think about the space inside the box but outside the text or image.

trace
intermediate
2:00remaining
CSS Specificity Calculation

Given the following CSS rules, which color will the <p> element have?

p { color: blue; }
#main p { color: red; }
.content p { color: green; }
ARed
BBlue
CGreen
DBlack (default)
Attempts:
2 left
💡 Hint

Remember that IDs have higher specificity than classes and element selectors.

Comparison
advanced
2:00remaining
Difference Between Flexbox and Grid

Which statement best describes the main difference between CSS Flexbox and CSS Grid?

AFlexbox requires JavaScript; Grid does not.
BFlexbox is for one-dimensional layouts; Grid is for two-dimensional layouts.
CFlexbox controls colors; Grid controls fonts.
DFlexbox is used only for mobile; Grid is used only for desktop.
Attempts:
2 left
💡 Hint

Think about layout directions and dimensions.

🔍 Analysis
advanced
2:00remaining
CSS Cascade and Inheritance

What color will the <span> text be in this HTML and CSS?

<style>
body { color: black; }
div { color: blue; }
span { color: inherit; }
</style>
<body>
  <div>
    <span>Hello</span>
  </div>
</body>
ABlack
BInherit causes an error
CBlue
DDefault browser color
Attempts:
2 left
💡 Hint

Consider what 'inherit' means in CSS.

identification
expert
2:00remaining
Identifying Accessibility Issues in CSS

Which CSS practice can cause accessibility problems for users with visual impairments?

AUsing high contrast colors for text and background
BUsing semantic HTML elements with CSS styling
CProviding keyboard focus styles for interactive elements
DUsing only color to convey important information
Attempts:
2 left
💡 Hint

Think about users who cannot distinguish colors well.

Practice

(1/5)
1. What is the main purpose of CSS in web pages?
easy
A. To style and change the appearance of web page elements
B. To write the content of the web page
C. To create the structure of the web page
D. To store data on the server

Solution

  1. Step 1: Understand CSS role

    CSS is used to style web pages by changing colors, fonts, and layout.
  2. Step 2: Differentiate from other web technologies

    HTML writes content, JavaScript adds behavior, CSS styles appearance.
  3. Final Answer:

    To style and change the appearance of web page elements -> Option A
  4. Quick Check:

    CSS = Styling [OK]
Hint: Remember: CSS = Style, HTML = Content [OK]
Common Mistakes:
  • Confusing CSS with HTML content writing
  • Thinking CSS stores data
  • Mixing CSS with JavaScript functionality
2. Which of the following is the correct CSS syntax to change the text color to blue?
easy
A. color: blue;
B. color = blue;
C. text-color: blue;
D. font-color = blue;

Solution

  1. Step 1: Recall CSS property syntax

    CSS uses property: value; format, for example, color: blue;
  2. Step 2: Check each option

    color: blue; uses correct syntax with colon and semicolon; others use wrong symbols or property names.
  3. Final Answer:

    color: blue; -> Option A
  4. Quick Check:

    Property: value; = color: blue; [OK]
Hint: CSS uses colon and semicolon for properties [OK]
Common Mistakes:
  • Using equal sign instead of colon
  • Using incorrect property names like text-color
  • Omitting semicolon at end
3. What will be the background color of the paragraph after applying this CSS?
p { background-color: yellow; }
medium
A. The paragraph text color will be yellow
B. The paragraph background will be yellow
C. The paragraph background will be transparent
D. The paragraph font size will change

Solution

  1. Step 1: Identify the selector and property

    The selector 'p' targets all paragraphs; property 'background-color' sets background color.
  2. Step 2: Understand the effect of background-color

    Setting background-color to yellow colors the paragraph's background yellow, not text or font size.
  3. Final Answer:

    The paragraph background will be yellow -> Option B
  4. Quick Check:

    background-color: yellow = yellow background [OK]
Hint: background-color changes background, not text color [OK]
Common Mistakes:
  • Confusing background-color with text color
  • Thinking font size changes with background-color
  • Ignoring the selector effect
4. Identify the error in this CSS code snippet:
h1 { font-size 20px; color: red }
medium
A. Color value should be in quotes
B. Wrong selector used
C. Missing colon after font-size property
D. Semicolon missing after color property

Solution

  1. Step 1: Check property syntax

    CSS properties require a colon between property and value, e.g., font-size: 20px;
  2. Step 2: Identify missing colon

    In the snippet, font-size 20px lacks colon, causing syntax error; color property is correct but missing semicolon is allowed if last.
  3. Final Answer:

    Missing colon after font-size property -> Option C
  4. Quick Check:

    Property: value; needs colon [OK]
Hint: Every CSS property needs a colon between name and value [OK]
Common Mistakes:
  • Omitting colon after property name
  • Thinking quotes are needed for color names
  • Confusing semicolon necessity at end
5. You want to style all <li> items inside a <ul> with a green font and 18px size, but only if they have the class highlight. Which CSS selector and properties will achieve this?
hard
A. li.highlight ul { color: green; font-size: 18px; }
B. ul.highlight li { color: green; font-size: 18px; }
C. li ul.highlight { color: green; font-size: 18px; }
D. ul li.highlight { color: green; font-size: 18px; }

Solution

  1. Step 1: Understand selector structure

    We want li elements with class highlight inside ul. The selector should be ul li.highlight.
  2. Step 2: Check properties for styling

    Properties color: green; and font-size: 18px; correctly style font color and size.
  3. Final Answer:

    ul li.highlight { color: green; font-size: 18px; } -> Option D
  4. Quick Check:

    Selector targets li.highlight inside ul [OK]
Hint: Class selectors use dot after element name: li.highlight [OK]
Common Mistakes:
  • Placing class on wrong element in selector
  • Reversing element order in selector
  • Using incorrect selector syntax