The `flex` shorthand property is a way to set the values of multiple flexbox properties in a single declaration. It can be used to set the `flex-grow`, `flex-shrink`, and `flex-basis` properties in a single line.

Here is a breakdown of each of the individual properties that can be set with the flex shorthand:

- **flex-grow**. This property determines how much a flex item should grow relative to the other items in the container. It takes a numerical value, and the default value is 0. A value of 1 means the item will grow at the same rate as the other items in the container, while a value of 2 means it will grow twice as fast;

- **flex-shrink**. This property determines how much a flex item should shrink relative to the other items in the container. It takes a numerical value, and the default value is 1. A value of 0 means the item will not shrink at all, while a value of 2 means it will shrink twice as fast as the other items;

- **flex-basis**: This property sets the default size of a flex item along the main axis. It can be specified in any length unit (e.g., px, em, %), and the default value is `auto`.

Here's an example of using the flex shorthand property to set all three values at once:
```css
.item {
  flex: 1 1 200px;
}
```
is equivalent to:
```css
.item {
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: 200px;
}
```

Here's an example of using the flex shorthand property to set just the `flex-grow` value:
```css
.item {
  flex: 2;
}
```
is equivalent to
```css
.item {
  flex-grow: 2;
  flex-shrink: 1;
  flex-basis: 0%;
}
```

Continue learning CSS. CSS, or Cascading Style Sheets, is a stylesheet language used to describe the presentation of a document written in a markup language like HTML. CSS is a fundamental building block of the modern web and controls the styling and layout of websites and web applications.

This section will cover the general styling used for layout and text formatting to create a visually appealing and user-friendly design for your webpage. Part II.

This section relates to colors and backgrounds in CSS. You will learn about various color formats, combining multiple colors into a gradient, and any CSS element's background management.

This section will focus on positioning elements on a webpage. By the end of this section, you should have a solid understanding of the different layout options available in CSS.

Introduction to CSS Part II

Flex Shorthand