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+### Bring it to life
+
+Still there? Well done! But hold on, here begins the serious part... In order to control your creation, you're going to plug its brain: JavaScript.
+
+[`Link a JS script`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script) to your `bring-it-to-life.html` file.
+In this script, you're going to close the left eye of your entity.
+To do so, you have to target the `eye-left` HTML element by its `id` thanks to the [`getElementById`](https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementById) method. Then, change the `style` of your `eye-left` to set its background color to black. We also need to modify its shape ; for that we are going to add a new class to it.
+First, define it in your CSS file:
+
+```
+.eye-closed {
+  height: 2px;
+  padding: 0 5px;
+  border-radius: 10px;
+}
+```
+
+In the JS file, add the freshly-created class `eye-closed` to the [`classList`](https://css-tricks.com/snippets/javascript/the-classlist-api/) of your `eye-left` element.
+
+Reload the page - it's alive! Your JS brain has control and orders your HTML/CSS body to close one eye.
+
+### Expected output
+
+This is what you should see in the browser:
+
+<!-- screenshot -->
+
+### Notions
+
+- [Link a JS script](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script)
+- [`getElementById`](https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementById)
+- [`classList` / `add()`](https://css-tricks.com/snippets/javascript/the-classlist-api/)