Gain insights into designing mobile-responsive web layouts using Flexbox. Delve into Box Model basics, Flexbox containers, and item alignment, and apply your knowledge to create stunning, mobile-first websites.

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In this course, you will get hands-on experience in designing mobile-responsive web layouts using Flexbox. You will start with the basics like the Box Model and the process of layouting.

You will then move on to advanced concepts such as Flexbox containers, and aligning individual Flexbox items. Near the end of the course, you will put everything you just learned into practice. You will work on a project that focuses on developing a mobile-first website where you’ll experiment with page layout, headers, footers, and a lot more.

By the end of this course, you will be able to use Flexbox in your own projects to create beautiful layouts.

Designing Web Layouts with CSS and Flexbox

We will combine the effects of `flex-direction` and `justify-content` in this section, and we will also develop an in-depth understanding of spacing around the flex-items.

## Exercise 1: Space calculation 

Assuming an `800px` wide Flex container and four `100px` wide (including borders) flex-items, calculate the following empty spaces in the example below: 

1. `flex-start`. The width of the light green rectangle after the fourth element.
2. `flex-end`. The width of the light green rectangle before the first element.
3. `center`. The width of the light green rectangle before the first element and the width of the light green rectangle after the last element.
4. `space-around`. The width of the following green rectangles: 
    - (i) the rectangle before the first element 
    - (ii) the rectangle after the last element 
    - (iii) the rectangles between two adjacent elements.
5. `space-between`. The width of the rectangles between two adjacent elements.
6. `space-evenly`. The width of the following green rectangles: 
    - (i) the rectangle before the first element 
    - (ii) the rectangle after the last element 
    - (iii) the rectangles between two adjacent elements.

Also, calculate the sum of the widths of all rectangles for each `justify-content` variant. Do they differ or are they equal?

This exercise will help you better understand how Flexbox positions Flex-items using `justify-content`. Even though you will not perform these calculations in the future by hand, chances are that solving this exercise helps you avoid a common Flexbox confusion. Most people mix up `space-around`, `space-between`, and `space-evenly`. This is your chance to develop an in-depth understanding of these options.

We will combine the effects of `flex-direction` and `justify-content` in this section, and we will also develop an in-depth understanding of spacing around the flex-items.

# Exercise 1: Space calculation 

Assuming an `800px` wide Flex container and four `100px` wide (including borders) flex-items, calculate the following empty spaces in the example below: 

1. `flex-start`. The width of the light green rectangle after the fourth element.
2. `flex-end`. The width of the light green rectangle before the first element.
3. `center`. The width of the light green rectangle before the first element and the width of the light green rectangle after the last element.
4. `space-around`. The width of the following green rectangles: 
    - (i) the rectangle before the first element 
    - (ii) the rectangle after the last element 
    - (iii) the rectangles between two adjacent elements.
5. `space-between`. The width of the rectangles between two adjacent elements.
6. `space-evenly`. The width of the following green rectangles: 
    - (i) the rectangle before the first element 
    - (ii) the rectangle after the last element 
    - (iii) the rectangles between two adjacent elements.

Also, calculate the sum of the widths of all rectangles for each `justify-content` variant. Do they differ or are they equal?

This exercise will help you better understand how Flexbox positions Flex-items using `justify-content`. Even though you will not perform these calculations in the future by hand, chances are that solving this exercise helps you avoid a common Flexbox confusion. Most people mix up `space-around`, `space-between`, and `space-evenly`. This is your chance to develop an in-depth understanding of these options.

This lesson is an exercise on justify-content property.

Getting Started

Using Flexbox Containers

Aligning Individual Flexbox Items

Designing a Mobile-first Website Using Flexbox

Flexbox Conclusion and Next Steps

Justify-content Exercises

Exercise 1: Space calculation