Mixin definition with @mixin in SASS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a mixin named 'center' that centers content using flexbox.

SASS

@mixin [1] {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

Acenter

Bflex-center

Calign-center

Dmiddle

Attempts:

3 left

💡 Hint

Common Mistakes

Using a name that does not match the instruction.

Forgetting to use '@mixin' keyword.

The mixin is named 'center' as per the instruction. The '@mixin' keyword defines it.

2fill in blank

medium

Complete the code to include the 'center' mixin inside a CSS rule for '.box'.

SASS

.box {
  [1] center;
  width: 10rem;
  height: 10rem;
  background-color: lightblue;
}

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

Ainclude

B@mixin

C@include

Dmixin

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@mixin' instead of '@include' to apply the mixin.

Omitting the '@' symbol.

To use a mixin inside a CSS rule, you use '@include' followed by the mixin name.

3fill in blank

hard

Fix the error in the mixin definition by completing the missing keyword.

SASS

[1] center {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

Ainclude

B@mixin

C@include

Dmixin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mixin' without '@'.

Using '@include' which is for applying mixins.

The correct keyword to define a mixin is '@mixin'.

4fill in blank

hard

Fill both blanks to define a mixin named 'rounded' that sets border-radius to 1rem.

SASS

@[1] [2] {
  border-radius: 1rem;
}

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

Amixin

Binclude

Crounded

Dradius

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@include' instead of '@mixin' to define.

Choosing a mixin name unrelated to the style.

The '@mixin' keyword defines the mixin, and 'rounded' is the mixin name.

5fill in blank

hard

Fill all three blanks to apply the 'rounded' mixin inside a '.button' rule and add a background color.

SASS

.button {
  [1] rounded;
  background-color: [2];
  padding: [3];
}

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

A@include

Bblue

C1rem

Dborder-radius

Attempts:

3 left

💡 Hint

Common Mistakes

Using '@mixin' instead of '@include' to apply.

Using invalid color names or missing units for padding.

Use '@include' to apply the mixin, set background-color to 'blue', and padding to '1rem'.

Practice

1. What is the main purpose of using @mixin in Sass?

easy

A. To create reusable blocks of CSS code

B. To define variables for colors

C. To import external CSS files

D. To write JavaScript inside Sass

Solution

1. Step 1: Understand what @mixin does

   @mixin is used to write reusable CSS blocks that can be included multiple times.

2. Step 2: Compare options

   Only 'To create reusable blocks of CSS code' correctly describes this purpose. Variables, imports, and JavaScript are unrelated to @mixin.

3. Final Answer:

   To create reusable blocks of CSS code -> Option A

4. Quick Check:

   Mixin = reusable CSS block [OK]

Hint: Mixins bundle CSS to reuse easily [OK]

Common Mistakes:

• Confusing mixins with variables
• Thinking mixins import files
• Assuming mixins run JavaScript

2. Which of the following is the correct syntax to define a mixin named button-style in Sass?

easy

A. @include button-style { color: blue; }

B. @mixin button-style { color: blue; }

C. @mixin: button-style { color: blue; }

D. mixin button-style() { color: blue; }

Solution

1. Step 1: Recall mixin definition syntax

   The correct way to define a mixin is using @mixin name { ... }.

2. Step 2: Check each option

   @mixin button-style { color: blue; } uses @mixin button-style { ... }, which is correct. @include button-style { color: blue; } uses @include which is for using mixins, not defining. Options C and D have invalid syntax.

3. Final Answer:

   @mixin button-style { color: blue; } -> Option B

4. Quick Check:

   Define mixin with @mixin [OK]

Hint: Define mixins with @mixin, use with @include [OK]

Common Mistakes:

• Using @include instead of @mixin to define
• Adding colon after @mixin
• Omitting @ symbol

3. Given the Sass code:

@mixin box-shadow($x, $y, $blur, $color) {
  box-shadow: $x $y $blur $color;
}

.button {
  @include box-shadow(2px, 4px, 6px, rgba(0,0,0,0.3));
}

What CSS will be generated for the .button class?

medium

A. .button { box-shadow: 2px 4px 6px rgba(0,0,0,0.3); }

B. .button { box-shadow: $x $y $blur $color; }

C. .button { box-shadow: 2px, 4px, 6px, rgba(0,0,0,0.3); }

D. Syntax error, no CSS generated

Solution

1. Step 1: Understand mixin parameters and usage

   The mixin box-shadow takes four parameters and sets the CSS box-shadow property using them.

2. Step 2: Substitute parameters in the mixin call

   The call @include box-shadow(2px, 4px, 6px, rgba(0,0,0,0.3)) replaces variables with these values, producing box-shadow: 2px 4px 6px rgba(0,0,0,0.3);.

3. Final Answer:

   .button { box-shadow: 2px 4px 6px rgba(0,0,0,0.3); } -> Option A

4. Quick Check:

   Mixin parameters replaced correctly [OK]

Hint: Parameters replace variables inside mixins [OK]

Common Mistakes:

• Leaving variables as $x, $y in output
• Using commas instead of spaces in CSS property
• Confusing @mixin and @include usage

4. Identify the error in this Sass code:

@mixin border-radius($radius) {
  border-radius: $radius;
}

.box {
  @mixin border-radius(10px);
}

medium

A. Mixin name should be borderRadius without hyphen

B. Missing semicolon after border-radius property

C. Using @mixin instead of @include to apply the mixin

D. Parameters cannot be passed to mixins

Solution

1. Step 1: Check mixin application syntax

   Mixins are defined with @mixin but applied with @include.

2. Step 2: Identify the incorrect usage

   The code uses @mixin border-radius(10px); inside .box, which is wrong. It should be @include border-radius(10px);.

3. Final Answer:

   Using @mixin instead of @include to apply the mixin -> Option C

4. Quick Check:

   Apply mixins with @include [OK]

Hint: Use @include to apply mixins, not @mixin [OK]

Common Mistakes:

• Confusing @mixin and @include
• Thinking parameters are not allowed
• Assuming hyphens are invalid in names

5. You want to create a mixin responsive-text that sets font size differently for small and large screens. Which of these mixin definitions correctly uses parameters and media queries?

hard

A. @mixin responsive-text($size) {
font-size: $size;
@media (min-width: 600px) {
font-size: calc($size * 2);
}
}

B. @mixin responsive-text {
font-size: 12px;
@media (min-width: 600px) {
font-size: 18px;
}
}

C. @mixin responsive-text($small, $large) {
font-size: $small;
@media (max-width: 600px) {
font-size: $large;
}
}

D. @mixin responsive-text($small-size, $large-size) {
font-size: $small-size;
@media (min-width: 600px) {
font-size: $large-size;
}
}

Solution

1. Step 1: Understand the goal

   The mixin should accept two sizes: one for small screens and one for large screens using a media query with min-width 600px.

2. Step 2: Analyze each option

   @mixin responsive-text($small-size, $large-size) { font-size: $small-size; @media (min-width: 600px) { font-size: $large-size; } } correctly defines two parameters and applies font sizes with a media query for screens wider than 600px. @mixin responsive-text { font-size: 12px; @media (min-width: 600px) { font-size: 18px; } } has no parameters, so not flexible. @mixin responsive-text($size) { font-size: $size; @media (min-width: 600px) { font-size: $size * 2; } } tries to multiply a variable inside CSS, which Sass does not support directly without interpolation or calculation. @mixin responsive-text($small, $large) { font-size: $small; @media (max-width: 600px) { font-size: $large; } } uses max-width media query incorrectly for large screens.

3. Final Answer:

   @mixin responsive-text($small-size, $large-size) { font-size: $small-size; @media (min-width: 600px) { font-size: $large-size; } } -> Option D

4. Quick Check:

   Parameters + correct media query = @mixin responsive-text($small-size, $large-size) { font-size: $small-size; @media (min-width: 600px) { font-size: $large-size; } } [OK]

Hint: Use parameters and min-width media query for responsive mixins [OK]

Common Mistakes:

• Not using parameters for flexibility
• Using max-width instead of min-width for large screens
• Trying to do math directly in CSS without Sass functions