public/subjects/nesting-organs/README.md

### Nesting organs

Bravo! You displayed the global shape of your entity, but now it's time to populate each division ; let's add up some organs!
To do so, we're going to introduce you the concept of nesting elements inside others.

So far, you just have a unique layer in your `<body>`: `face`, `upper-body` & `lower-body` are all at the same level.
But as you know, on a face, there are 2 eyes, a nose, and a mouth - and inside that mouth, a tongue, etc. ; any element can potentially be a container for other elements.

Let's add new elements and wrap them in different layers ; convert this list of organs in a HTML structure with the corresponding given tags!

- face: `section` tag with `id` `face`
  - eyes: `div` tag with `id` `eyes`
    - eye left: `p` tag with `id` `eye-left`
    - eye right: `p` tag with `id` `eye-right`
- upper body: `section` tag with `id` `upper-body`
  - arm left: `div` tag with `id` `arm-left`
  - torso: `div` tag with `id` `torso`
  - arm right: `div` tag with `id` `arm-right`
- lower body: `section` tag with `id` `lower-body`
  - left leg: `div` tag with `id` `leg-left`
  - right leg: `div` tag with `id` `leg-right`

Modify your CSS file to add rulesets to `section` tags: `display` at "flex" and `justify-content` at "center" (this is to turn the `section` tags into [`flex` containers](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox), so the elements inside will be centered)

Add also the following CSS to your `styles.css` file to see the freshly-added nested elements:

```
div,
p {
  border: solid 1px black;
  padding: 10px;
  margin: 0;
  border-radius: 30px;
}

#face {
  align-items: center;
}

#eyes {
  display: flex;
  background-color: yellow;
  justify-content: space-between;
  align-items: center;
  border-radius: 50px;
  width: 200px;
}

#torso {
  width: 200px;
  background-color: violet;
}
```

### Expected output

This is what you should see in the browser:

<!-- screenshot -->

### Notions

- [Anatomy of an HTML element](https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/Getting_started#anatomy_of_an_html_element)
- [Nesting HTML elements](https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/Getting_started#nesting_elements)
- [Flexbox layout](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox), you can train on [Flexbox froggy](https://flexboxfroggy.com/)
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago			`### Nesting organs`

			`Bravo! You displayed the global shape of your entity, but now it's time to populate each division ; let's add up some organs!`
			`To do so, we're going to introduce you the concept of nesting elements inside others.`

			So far, you just have a unique layer in your `<body>`: `face`, `upper-body` & `lower-body` are all at the same level.
			`But as you know, on a face, there are 2 eyes, a nose, and a mouth - and inside that mouth, a tongue, etc. ; any element can potentially be a container for other elements.`

			`Let's add new elements and wrap them in different layers ; convert this list of organs in a HTML structure with the corresponding given tags!`

			- face: `section` tag with `id` `face`
			- eyes: `div` tag with `id` `eyes`
			- eye left: `p` tag with `id` `eye-left`
			- eye right: `p` tag with `id` `eye-right`
			- upper body: `section` tag with `id` `upper-body`
			- arm left: `div` tag with `id` `arm-left`
			- torso: `div` tag with `id` `torso`
			- arm right: `div` tag with `id` `arm-right`
			- lower body: `section` tag with `id` `lower-body`
			- left leg: `div` tag with `id` `leg-left`
			- right leg: `div` tag with `id` `leg-right`

Update subject exercise 4 "Nesting organs" 4 years ago			Modify your CSS file to add rulesets to `section` tags: `display` at "flex" and `justify-content` at "center" (this is to turn the `section` tags into [`flex` containers](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox), so the elements inside will be centered)
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago
Update subject exercise 4 "Nesting organs" 4 years ago			Add also the following CSS to your `styles.css` file to see the freshly-added nested elements:
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago
Update subject exercise 4 "Nesting organs" 4 years ago			```
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago			`div,`
			`p {`
			`border: solid 1px black;`
Update subject exercise 4 "Nesting organs" 4 years ago			`padding: 10px;`
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago			`margin: 0;`
Update subject exercise 4 "Nesting organs" 4 years ago			`border-radius: 30px;`
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago			`}`

			`#face {`
			`align-items: center;`
			`}`

			`#eyes {`
			`display: flex;`
Update subject exercise 4 "Nesting organs" 4 years ago			`background-color: yellow;`
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago			`justify-content: space-between;`
Update exercise 4 "Nesting organs" 4 years ago			`align-items: center;`
Update subject exercise 4 "Nesting organs" 4 years ago			`border-radius: 50px;`
			`width: 200px;`
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago			`}`

			`#torso {`
Update subject exercise 4 "Nesting organs" 4 years ago			`width: 200px;`
Subject exercise 4 "Nesting organs" (HTML structure) 4 years ago			`background-color: violet;`
			`}`
			```

			`### Expected output`

			`This is what you should see in the browser:`

			`<!-- screenshot -->`

			`### Notions`

			`- [Anatomy of an HTML element](https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/Getting_started#anatomy_of_an_html_element)`
			`- [Nesting HTML elements](https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/Getting_started#nesting_elements)`
Update subject exercise 4 "Nesting organs" 4 years ago			`- [Flexbox layout](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox), you can train on [Flexbox froggy](https://flexboxfroggy.com/)`