Subject exercise 5 "Class that" (CSS class)

subjects/class-that/README.md

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+### Class that
+
+Alright, your being is almost done, some elements still need a bit more shaping and then we'll make it come to life!
+If you look at your page, you can observe that some elements are repeated: the eyes, the arms & the legs. It is the same organ, one on the left and one on the right. They have exactly the same shape, so for practicity & to avoid to repeat twice the same style, we're not going to use their `id` to style them, but a [`class`](https://developer.mozilla.org/en-US/docs/Web/CSS/Class_selectors) ; contrary to an `id`, a `class` can be attributed to several different elements with common rulesets, and so the style defined for that class will apply to all the HTML elements that have it.
+
+Create the 3 following classes, setting them with the given rulesets, & attribute them to the corresponding HTML elements:
+
+- class `eye`:
+  - `height` of 10 pixels
+  - `background-color` "red"
+  - `border-radius` of 50%
+  - attributed to `eye-left` & `eye-right`
+- class `arm`:
+  - `background-color` "aquamarine"
+  - attributed to `arm-left` & `arm-right`
+- class `leg`:
+  - `background-color` "blue"
+  - attributed to `leg-left` & `leg-right`
+
+You can attribute several classes to a same element ; create the class `width10`, which set the `width` to 10 pixels, and add it to the `class` attribute of all the repeated elements: `eye-left`, `eye-right`, `arm-left`, `arm-right`, `leg-left` & `leg-left`.
+
+### Expected output
+
+This is what you should see in the browser:
+
+<!-- screenshot -->
+
+### Notions
+
+- [CSS class](https://developer.mozilla.org/en-US/docs/Web/CSS/Class_selectors)