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CSSmarkup~20 mins

First CSS stylesheet - Practice Problems & Coding Challenges

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Challenge - 5 Problems
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CSS Stylesheet Master
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Test your skills under time pressure!
📝 Syntax
intermediate
2:00remaining
What is the output of this CSS code?
Given the following CSS, what color will the text inside the <p> tag be?
CSS
p {
  color: blue;
  font-size: 1.5rem;
}
AThe text will be black.
BThe text will be red.
CThe text will be invisible.
DThe text will be blue.
Attempts:
2 left
💡 Hint
Look at the color property inside the p selector.
❓ selector
intermediate
2:00remaining
Which selector applies styles to all elements with class 'highlight'?
You want to style all elements that have the class 'highlight'. Which CSS selector should you use?
A#highlight { background-color: yellow; }
B.highlight { background-color: yellow; }
Chighlight { background-color: yellow; }
D*highlight { background-color: yellow; }
Attempts:
2 left
💡 Hint
Class selectors start with a dot (.)
❓ layout
advanced
2:00remaining
What layout will this CSS produce?
Consider this CSS applied to a container and its children. What layout will the children have?
CSS
.container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
AChildren will be stacked vertically with space between them.
BChildren will be arranged horizontally with no space.
CChildren will overlap each other.
DChildren will be hidden.
Attempts:
2 left
💡 Hint
flex-direction: column stacks items vertically.
❓ accessibility
advanced
2:00remaining
Which CSS rule improves text accessibility?
Which CSS rule helps improve readability for users with visual impairments?
Abody { color: #000000; background-color: #ffffff; }
Bbody { color: #777777; background-color: #888888; }
Cbody { color: #cccccc; background-color: #dddddd; }
Dbody { color: #ffffff; background-color: #ffffff; }
Attempts:
2 left
💡 Hint
High contrast between text and background helps readability.
🧠 Conceptual
expert
2:00remaining
What happens if you omit the charset meta tag in your HTML when linking a CSS file?
You link a CSS file in your HTML but forget to include the <meta charset="UTF-8"> tag in the <head>. What is the likely effect?
AThe HTML page will not render at all.
BThe CSS will load normally without any issues.
CThe CSS file might not load correctly if it contains special characters.
DThe browser will automatically add the charset meta tag.
Attempts:
2 left
💡 Hint
Charset tells the browser how to read characters in files.

Practice

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

Solution

  1. Step 1: Understand CSS role

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

  2. Step 2: Differentiate from other web technologies

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

  3. Final Answer:

    To control the appearance and layout of HTML elements on a webpage -> Option A

  4. Quick Check:

    CSS = style control [OK]
Hint: Remember: CSS styles, HTML structures, JS acts [OK]
Common Mistakes:
  • Confusing CSS with JavaScript functionality
  • Thinking CSS stores webpage content
  • Believing CSS adds interactivity
2. Which of the following is the correct way to link an external CSS file named styles.css in an HTML document?
easy
A. <link rel="stylesheet" href="styles.css">
B. <style src="styles.css"></style>
C. <script src="styles.css"></script>
D. <css href="styles.css">

Solution

  1. Step 1: Identify correct HTML tag for CSS linking

    The <link> tag with rel="stylesheet" and href attribute is used to link CSS files.

  2. Step 2: Check other options for correctness

    <style> tag does not use src, <script> is for JavaScript, <css> is invalid HTML.

  3. Final Answer:

    <link rel="stylesheet" href="styles.css"> -> Option A

  4. Quick Check:

    Use <link rel="stylesheet"> to link CSS [OK]
Hint: Link CSS with <link rel="stylesheet" href="file.css"> [OK]
Common Mistakes:
  • Using <style> tag with src attribute
  • Using <script> tag for CSS
  • Writing invalid tags like <css>
3. Given the CSS below, what color will the paragraph text be?
p { color: blue; }
p.special { color: red; }

And the HTML:
<p class="special">Hello!</p>
medium
A. Blue
B. Red
C. Black (default)
D. Green

Solution

  1. Step 1: Understand CSS selector specificity

    The selector p.special targets paragraphs with class "special" and overrides p styles.

  2. Step 2: Apply styles to the HTML element

    The paragraph has class "special", so it uses the color red from p.special.

  3. Final Answer:

    Red -> Option B

  4. Quick Check:

    More specific selector wins = red [OK]
Hint: Class selectors override element selectors [OK]
Common Mistakes:
  • Ignoring class selector specificity
  • Assuming first rule always applies
  • Confusing color names
4. What is wrong with this CSS code?
body {
  background-color: #fff
  color: black;
}
medium
A. Using body selector is invalid
B. Incorrect color value for background-color
C. Missing semicolon after background-color property
D. Properties should be inside <style> tags

Solution

  1. Step 1: Check CSS property syntax

    Each property must end with a semicolon except the last one, but here background-color is not last and misses semicolon.

  2. Step 2: Validate other parts

    Color value #fff is valid, body selector is valid, CSS can be inside external or style tags.

  3. Final Answer:

    Missing semicolon after background-color property -> Option C

  4. Quick Check:

    Every CSS property line needs semicolon [OK]
Hint: Check semicolons after each CSS property line [OK]
Common Mistakes:
  • Forgetting semicolons between properties
  • Thinking #fff is invalid color
  • Believing body selector is wrong
5. You want all <h1> headings on your page to be green, but only those inside a <section> should be bold. Which CSS code achieves this?
hard
A. h1 { font-weight: bold; }
section h1 { color: green; }
B. h1 { color: green; font-weight: bold; }
section h1 { color: green; }
C. section h1 { color: green; font-weight: bold; }
h1 { font-weight: normal; }
D. h1 { color: green; }
section h1 { font-weight: bold; }

Solution

  1. Step 1: Set all h1 color to green

    The rule h1 { color: green; } colors all h1 headings green.

  2. Step 2: Make only h1 inside section bold

    The rule section h1 { font-weight: bold; } targets only h1 inside section and makes them bold.

  3. Final Answer:

    h1 { color: green; } section h1 { font-weight: bold; } -> Option D

  4. Quick Check:

    General style first, then specific override [OK]
Hint: Style all, then add specific inside selector [OK]
Common Mistakes:
  • Applying bold to all h1 instead of only inside section
  • Overwriting color unintentionally
  • Using wrong selector order