First SASS stylesheet - Mini Project: Build & Apply

First SASS Stylesheet

📖 Scenario: You are creating a simple webpage style using SASS to make your CSS easier to manage and read.

🎯 Goal: Build a SASS stylesheet that defines a color variable, uses it for a background color, and styles a heading with a font size and color.

📋 What You'll Learn

Create a SASS variable for a primary color

Use the variable to set the background color of the body

Style an h1 heading with a font size and color

Use nested syntax to style the h1 inside the body

💡 Why This Matters

🌍 Real World

SASS is used in real websites to write CSS faster and keep styles organized.

💼 Career

Knowing SASS is valuable for front-end developers to maintain large style codebases efficiently.

1

Create a SASS variable for the primary color

Write a SASS variable called $primary-color and set it to #3498db.

SASS

// Your code here

Hint

Variables in SASS start with a dollar sign $.

2

Set the body background color using the variable

Write a body selector and set its background-color property to the $primary-color variable.

SASS

$primary-color: #3498db;

// Your code here

Hint

Use the variable by writing its name with the dollar sign inside the property value.

3

Add styles for the h1 inside the body using nesting

Inside the body selector, nest an h1 selector. Set its font-size to 2rem and color to white.

SASS

$primary-color: #3498db;

body {
  background-color: $primary-color;
  // Your code here
}

Hint

Use nested syntax by writing the h1 selector inside the body block.

4

Complete the SASS stylesheet

Make sure the SASS code includes the $primary-color variable, the body selector with background-color, and the nested h1 with font-size and color properties.

SASS

$primary-color: #3498db;

body {
  background-color: $primary-color;
  h1 {
    font-size: 2rem;
    color: white;
  }
}
// Your code here if needed

Hint

Review your code to ensure all parts are included exactly as instructed.

Practice

1. What is the main benefit of using variables in a SASS stylesheet?

easy

A. They automatically fix CSS errors.

B. They make the stylesheet load faster in the browser.

C. They let you reuse values like colors and sizes easily.

D. They convert SASS to JavaScript.

Solution

1. Step 1: Understand what variables do in SASS

   Variables store values such as colors or sizes so you can reuse them without repeating the same value.

2. Step 2: Compare options with this understanding

   Only They let you reuse values like colors and sizes easily. correctly describes this benefit. Other options describe unrelated or incorrect features.

3. Final Answer:

   They let you reuse values like colors and sizes easily. -> Option C

4. Quick Check:

   Variables store reusable values = A [OK]

Hint: Variables store reusable values like colors or sizes [OK]

Common Mistakes:

• Thinking variables speed up browser loading
• Believing variables fix CSS errors automatically
• Confusing SASS variables with JavaScript

2. Which of the following is the correct way to declare a variable in SASS?

easy

A. $main-color: #3498db;

B. var main-color = #3498db;

C. main-color: #3498db;

D. @main-color: #3498db;

Solution

1. Step 1: Recall SASS variable syntax

   In SASS, variables start with a dollar sign ($) followed by the name, then a colon and the value.

2. Step 2: Match options to this syntax

   $main-color: #3498db; matches this exactly. Options B, C, and D use incorrect syntax.

3. Final Answer:

   $main-color: #3498db; -> Option A

4. Quick Check:

   Variables start with $ in SASS = A [OK]

Hint: Variables always start with $ in SASS [OK]

Common Mistakes:

• Using var keyword like JavaScript
• Omitting the $ sign before variable name
• Using @ instead of $ for variables

3. What will be the output CSS of this SASS code?

$primary-color: #ff0000;

.button {
  color: $primary-color;
  &:hover {
    color: darken($primary-color, 20%);
  }
}

medium

A. .button { color: $primary-color; }
.button:hover { color: darken($primary-color, 20%); }

B. Syntax error: darken function not recognized

C. .button { color: #ff0000; }
.button:hover { color: #ff3333; }

D. .button { color: #ff0000; }
.button:hover { color: #cc0000; }

Solution

1. Step 1: Understand variable substitution and nesting

   The variable $primary-color is replaced with #ff0000. The nested &:hover becomes .button:hover.

2. Step 2: Calculate darken color

   darken(#ff0000, 20%) makes the red darker, resulting in #cc0000.

3. Final Answer:

   .button { color: #ff0000; } .button:hover { color: #cc0000; } -> Option D

4. Quick Check:

   Variables replaced and nesting expanded = B [OK]

Hint: Variables replaced, nesting expands selectors [OK]

Common Mistakes:

• Leaving variables as-is in output CSS
• Not expanding nested selectors
• Misunderstanding darken color function

4. Identify the error in this SASS code:

$font-size: 16px

body {
  font-size: $font-size;
}

medium

A. body selector cannot be used in SASS

B. Missing semicolon after variable declaration

C. font-size property is invalid

D. Variable name should not start with $

Solution

1. Step 1: Check variable declaration syntax

   In SASS, each statement must end with a semicolon. The variable declaration lacks a semicolon.

2. Step 2: Verify other parts

   Variable names start with $, font-size is valid, and body selector is allowed.

3. Final Answer:

   Missing semicolon after variable declaration -> Option B

4. Quick Check:

   Semicolon missing after $font-size declaration = D [OK]

Hint: Always end variable declarations with semicolon [OK]

Common Mistakes:

• Omitting semicolon after variable
• Thinking $ is invalid for variables
• Assuming selectors can't be used

5. You want to create a SASS stylesheet where all buttons have a background color stored in a variable, and on hover, the background becomes 15% lighter. Which SASS code correctly achieves this?

hard

A. $btn-bg: #007bff;

button {
background-color: $btn-bg;
&:hover {
background-color: lighten($btn-bg, 15%);
}
}

B. $btn-bg: #007bff

button {
background-color: $btn-bg;
&:hover {
background-color: lighten($btn-bg, 15%)
}
}

C. $btn-bg: #007bff;

button {
background-color: $btn-bg;
&:hover {
background-color: darken($btn-bg, 15%);
}
}

D. $btn-bg: #007bff;

button {
background-color: $btn-bg;
&:hover {
background-color: $btn-bg + 15%;
}
}

Solution

1. Step 1: Check variable declaration and syntax

   $btn-bg: #007bff; button { background-color: $btn-bg; &:hover { background-color: lighten($btn-bg, 15%); } } correctly declares $btn-bg with a semicolon and uses proper nesting with &:hover.

2. Step 2: Verify color function usage

   $btn-bg: #007bff; button { background-color: $btn-bg; &:hover { background-color: lighten($btn-bg, 15%); } } uses lighten($btn-bg, 15%) to make the color lighter on hover, which matches the requirement.

3. Step 3: Identify errors in other options

   $btn-bg: #007bff button { background-color: $btn-bg; &:hover { background-color: lighten($btn-bg, 15%) } } misses semicolons; $btn-bg: #007bff; button { background-color: $btn-bg; &:hover { background-color: darken($btn-bg, 15%); } } darkens instead of lightens; $btn-bg: #007bff; button { background-color: $btn-bg; &:hover { background-color: $btn-bg + 15%; } } tries invalid addition of color and percentage.

4. Final Answer:

   $btn-bg: #007bff; button { background-color: $btn-bg; &:hover { background-color: lighten($btn-bg, 15%); } } -> Option A

5. Quick Check:

   Correct variable, nesting, and lighten function = C [OK]

Hint: Use lighten() with correct syntax and semicolons [OK]

Common Mistakes:

• Forgetting semicolons after declarations
• Using darken instead of lighten
• Trying to add percentage directly to color