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.

CBCA - CSS with Flexbox (Intermediate)-01.jpg

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

# Step 1: Removing the hamburger menu 

First, let's remove the hamburger menu from the markup, and the corresponding styles in the CSS. This includes removing the styles responsible for hiding the default grey menu.

Remove this line from the HTML code:

```html
<div class="hamburger-box"></div>
```

Also remove the following CSS rules:

```css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    display: flex;
    justify-content: space-between;
    margin: 20px;
    height: 30px;
}

.logo {
    height: 30px;
    flex-basis: 485px;
    flex-grow: 1;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    flex-basis: 243px;
    background-color: lightsteelblue;
    /* display: none; */
}

/*
.hamburger-box {
    display: inline-block;
    width: 30px;
    min-width: 30px;
    height: 30px;
    background-color: aqua;
}
*/


@media screen and (min-width: 768px) {
    .flex-container {
        display: flex;
        justify-content: space-evenly;
    }

/*
    .hamburger-box {
        display: none;
    }
*/

    .logo {
        flex-grow: 2;
    }

    .main-navigation {
        display: block;
        flex-grow: 1;
    }

    .flex-item {
        display: inline-block;
        list-style: none;
    }
}
```

The grey menu is still not correct on small screen sizes. 

# Step 2: Removing the breakpoint

There is no need for a breakpoint anymore, because we will have the same menu on all screen sizes. Therefore, we can unify the styles below `768px` and above `768px` screen widths.

```css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    display: flex;
    justify-content: space-between;
    margin: 20px;
    height: 30px;
}

.logo {
    height: 30px;
    flex-basis: 485px;
    flex-grow: 2;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    background-color: lightsteelblue;
    display: block;
    flex-grow: 1;
    flex-basis: 243px; 
}

.flex-container {
    display: flex;
    justify-content: space-evenly;
}

.flex-item {
    display: inline-block;
    list-style: none;
}
```

# Step 3: Shrinking the logo three times as fast as the menu

We can add proportional shrinking to the `.logo` and the `.main-navigation` elements. The title should shrink three times as fast as the main navigation, therefore its `flex-shrink` value should be `3`.

```css
.logo {
    height: 30px;
    flex-basis: 485px;
    flex-grow: 2;
    flex-shrink: 3;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    background-color: lightsteelblue;
    display: block;
    flex-grow: 1;
    flex-shrink: 1;
    flex-basis: 243px; 
}
```

Let's rewrite these two styles using the recently learned `flex` property: 

```css
.logo {
    height: 30px;
    flex: 2 3 485px;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    background-color: lightsteelblue;
    display: block;
    flex: 1 1 243px;
}
```

# Step 4: Apply a `min-width` to the container

Let's test the solution with `320px`. This width should be small enough for the content to fit on the screen.

```css
header {
    display: flex;
    justify-content: space-between;
    margin: 20px;
    height: 30px;
    min-width: 320px;
}
```

The final solution looks as follows:


# Step 1: Removing the hamburger menu 

First, let's remove the hamburger menu from the markup, and the corresponding styles in the CSS. This includes removing the styles responsible for hiding the default grey menu.

Remove this line from the HTML code:

```html
<div></div>
```

Also remove the following CSS rules:

```css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    display: flex;
    justify-content: space-between;
    margin: 20px;
    height: 30px;
}

.logo {
    height: 30px;
    flex-basis: 485px;
    flex-grow: 1;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    flex-basis: 243px;
    background-color: lightsteelblue;
    /* display: none; */
}

/*
.hamburger-box {
    display: inline-block;
    width: 30px;
    min-width: 30px;
    height: 30px;
    background-color: aqua;
}
*/


@media screen and (min-width: 768px) {
    .flex-container {
        display: flex;
        justify-content: space-evenly;
    }

/*
    .hamburger-box {
        display: none;
    }
*/

    .logo {
        flex-grow: 2;
    }

    .main-navigation {
        display: block;
        flex-grow: 1;
    }

    .flex-item {
        display: inline-block;
        list-style: none;
    }
}
```

The grey menu is still not correct on small screen sizes. 

# Step 2: Removing the breakpoint

There is no need for a breakpoint anymore, because we will have the same menu on all screen sizes. Therefore, we can unify the styles below `768px` and above `768px` screen widths.

```css
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    display: flex;
    justify-content: space-between;
    margin: 20px;
    height: 30px;
}

.logo {
    height: 30px;
    flex-basis: 485px;
    flex-grow: 2;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    background-color: lightsteelblue;
    display: block;
    flex-grow: 1;
    flex-basis: 243px; 
}

.flex-container {
    display: flex;
    justify-content: space-evenly;
}

.flex-item {
    display: inline-block;
    list-style: none;
}
```

# Step 3: Shrinking the logo three times as fast as the menu

We can add proportional shrinking to the `.logo` and the `.main-navigation` elements. The title should shrink three times as fast as the main navigation, therefore its `flex-shrink` value should be `3`.

```css
.logo {
    height: 30px;
    flex-basis: 485px;
    flex-grow: 2;
    flex-shrink: 3;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    background-color: lightsteelblue;
    display: block;
    flex-grow: 1;
    flex-shrink: 1;
    flex-basis: 243px; 
}
```

Let's rewrite these two styles using the recently learned `flex` property: 

```css
.logo {
    height: 30px;
    flex: 2 3 485px;
    background-color: lightgreen;
}

.main-navigation {
    height: 30px;
    background-color: lightsteelblue;
    display: block;
    flex: 1 1 243px;
}
```

# Step 4: Apply a `min-width` to the container

Let's test the solution with `320px`. This width should be small enough for the content to fit on the screen.

```css
header {
    display: flex;
    justify-content: space-between;
    margin: 20px;
    height: 30px;
    min-width: 320px;
}
```

The final solution looks as follows:


This lesson is the solution to the flex shorthand notation exercise in the previous lesson.

Getting Started

Using Flexbox Containers

Aligning Individual Flexbox Items

Designing a Mobile-first Website Using Flexbox

Flexbox Conclusion and Next Steps

Flex Shorthand Notation Solution

Step 1: Removing the hamburger menu