Subject exercise 3 "Select & style" (CSS basics, selectors)

subjects/select-and-style/README.md

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+### Select & style
+
+Now that you created & identified properly the different elements of your being, it's time to make it look more living-like! To achieve that, you're going to style it with [CSS](https://developer.mozilla.org/en-US/docs/Web/CSS).
+Create a CSS file, [link it](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link#including_a_stylesheet) to your `index.html`, and :
+
+- target all the elements with the [universal selector](https://developer.mozilla.org/en-US/docs/Web/CSS/Universal_selectors) and style them with an `opacity` of 0.8
+- target all the `section` tags with the [type selector](https://developer.mozilla.org/en-US/docs/Web/CSS/Type_selectors), and style it with a `padding` of 20 pixels and a `margin` of 15 pixels
+- target each following element with the [`id` selector](https://developer.mozilla.org/en-US/docs/Web/CSS/ID_selectors), using the `id` you defined earlier for each section, and style it:
+  - `face` with a `width` & `height` of 80 pixels, and a "lime" `background-color`
+  - `upper-body` with a `width` of 200 pixels, a `height` of 220 pixels, and a "deeppink" `background-color`
+  - `lower-body` with a `width` of 100 pixels, a `height` of 220 pixels, and a "yellow" `background-color`
+- target the `body` tag and style it with a `display` at "flex", a `flex-direction` at "column" and a `align-items` at "center" (this is to turn the `body` into a [`flex` container](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexbox), so the elements will be centered in the page)
+
+To style an element, you systematically have to declare [rulesets](https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web/CSS_basics#anatomy_of_a_css_ruleset), composed of a property and a value.
+Here is an exemple of how to set the color of `div` tags to "red":
+
+```div {
+  color: red;
+}
+```
+
+### Notions
+
+- [`link` a CSS file](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link#including_a_stylesheet)
+- [CSS basics](https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web/CSS_basics)
+- [ruleset](https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web/CSS_basics#anatomy_of_a_css_ruleset)
+- [List of different selectors](https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web/CSS_basics#different_types_of_selectors)
+- [universal selector](https://developer.mozilla.org/en-US/docs/Web/CSS/Universal_selectors)
+- [type selector](https://developer.mozilla.org/en-US/docs/Web/CSS/Type_selectors)
+- [`id` selector](https://developer.mozilla.org/en-US/docs/Web/CSS/ID_selectors)
+- [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/)