What is CSS - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the background color of the page to light blue.

CSS

body {
  background-color: [1];
}

Drag options to blanks, or click blank then click option'

Ablue

Blightblue

Cred

Dgreen

Attempts:

3 left

💡 Hint

Common Mistakes

Using color names that are too dark or not the intended shade.

Forgetting to add a semicolon after the property value.

The background-color property sets the background color of an element. Here, lightblue is the correct color name to use.

2fill in blank

medium

Complete the code to make all paragraphs have a font size of 16 pixels.

CSS

p {
  font-size: [1];
}

Drag options to blanks, or click blank then click option'

A20px

B12px

C16px

D1.5em

Attempts:

3 left

💡 Hint

Common Mistakes

Using units other than pixels when pixels are requested.

Choosing a font size that is too small or too large.

The font-size property controls the size of text. Here, 16px sets the font size to 16 pixels.

3fill in blank

hard

Fix the error in the code to correctly center text inside a div.

CSS

div {
  text-align: [1];
}

Drag options to blanks, or click blank then click option'

Acenter

Bleft

Cjustify

Dright

Attempts:

3 left

💡 Hint

Common Mistakes

Using justify which spreads text evenly but does not center it.

Using left or right which align text to sides.

The text-align property controls horizontal alignment of text. To center text, use center.

4fill in blank

hard

Fill both blanks to create a CSS rule that makes all headings blue and bold.

CSS

h1, h2, h3 {
  color: [1];
  font-weight: [2];
}

Drag options to blanks, or click blank then click option'

Ablue

Bred

Cbold

Dnormal

Attempts:

3 left

💡 Hint

Common Mistakes

Using red instead of blue for color.

Using normal instead of bold for font weight.

The color property sets text color, and font-weight controls boldness. Use blue for color and bold for font weight.

5fill in blank

hard

Fill all three blanks to create a CSS rule that sets a green border, 2 pixels thick, and solid style around images.

CSS

img {
  border-color: [1];
  border-width: [2];
  border-style: [3];
}

Drag options to blanks, or click blank then click option'

Ared

B2px

Csolid

Dgreen

Attempts:

3 left

💡 Hint

Common Mistakes

Using red instead of green for color.

Forgetting to add units like px for border width.

Using dashed or dotted instead of solid style.

The border-color sets the border color, border-width sets thickness, and border-style sets the border style. Here, green color, 2 pixels width, and solid style are correct.

Practice

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