update

exercises/04-Class-Selector/README.md

@@ -1,3 +1,7 @@
+---
+tutorial: "https://www.youtube.com/watch?v=RffCSMXgWFc"
+---
+
 # `04` Class Selector
 
 There are many ways to select HTML elements to apply styles to them, so far we have only use the `tag` selector, lets talk about the `.class` selector:

exercises/04.1-Combined-Rules/README.md

@@ -1,3 +1,7 @@
+---
+tutorial: "https://youtu.be/watch?v=uQS5QeEE-B4"
+---
+
 # `04.1` Combined Rules
 
 CSS files take space on your server and also take time to download (like everything); it is yet another text document that the browser has to download before rendering the page, which is why is important to keep the CSS document as small as possible.

exercises/04.1-Combined-Rules/styles.css

@@ -1,12 +1,12 @@
-.what {
+.myBox {
 	width: 50px;
 	height: 50px;
 	padding-top: 10px;
 	padding-left: 30px;
 	padding-right: 190px;
 	padding-bottom: 50px;
-	/* padding: 10px 30px 50px 190px; */
-	background: rgb(189, 189, 189);
+
+    background: rgb(189, 189, 189);
 	background-image: url(https://assets.breatheco.de/apis/img/funny/baby.jpg);
 	background-position-x: 100px;
 	background-repeat: no-repeat;

exercises/04.2-Apply-several-classes/README.md

@@ -1,3 +1,7 @@
+---
+tutorial: "https://www.youtube.com/watch?v=da4tJDx48CY"
+---
+
 # `04.2` Apply several classes
 
 We have prepared a small CSS Stylesheet that contains the CSS styles to replicate poker cards.

exercises/04.3-id-Selector/README.es.md

@@ -1,4 +1,4 @@
-# `04` Selector de clase
+# `04.3` Selector de ID
 
 También puedes seleccionar un elemento por su `#id` y aplicarle estilos.
 

exercises/04.3-id-Selector/README.md

@@ -1,4 +1,10 @@
-# `04` Class Selector
+---
+tutorial: "https://www.youtube.com/watch?v=9906LCSQJ8"
+---
+---
+tutorial: "https://www.youtube.com/watch?v=9906LCSQJ8"
+---
+# `04.3` The ID CSS Selector
 
 You can also select an element by `#id` and apply stiles to it.
 

exercises/05-Specificity/README.md

@@ -1,3 +1,7 @@
+---
+tutorial: "https://www.youtube.com/watch?v=3JxXkhxyAnI"
+---
+
 # `05` Specificity
 
 When creating a CSS document, you need to start from the most generic selector and end with the most specific ones, that is the way CSS works.

exercises/06-Practicing-Rules/README.md

@@ -1,3 +1,7 @@
+---
+tutorial: "https://www.youtube.com/watch?v=4wguurrl-lU"
+---
+
 # `06` Practicing Rules
 
 ## 📝 Instructions: