Responsive Web Design: Added hint to Prioritize One Style Over Another (#22020)

* Responsive Web Design: Added hint to Prioritize One Style Over Another

Added hint to Prioritize One Style Over Another (https://guide.freecodecamp.org/certifications/responsive-web-design/basic-css/prioritize-one-style-over-another and https://learn.freecodecamp.org/responsive-web-design/basic-css/prioritize-one-style-over-another)

* Added   </style> in 23 line

guide/english/certifications/responsive-web-design/basic-css/prioritize-one-style-over-another/index.md

@@ -3,8 +3,50 @@ title: Prioritize One Style Over Another
 ---
 ## Prioritize One Style Over Another
 
-This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/responsive-web-design/basic-css/prioritize-one-style-over-another/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
-
-<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
-
 <!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+We need to create a CSS class called ```pink-text``` that gives an our ```h1``` element the color pink.
+
+### Solution
+
+  Between ```<style>``` and ```</style>``` create a class called ```pink-text```:
+
+```css
+  <style>
+    body {
+      background-color: black;
+      font-family: monospace;
+      color: green;
+    }
+    .pink-text {
+
+    }
+  </style>
+  ```
+  And add in this class ```color``` with value of ```pink```:
+  
+  ```css
+  .pink-text {
+    color: pink;
+  }
+  ```
+After, add this class to our ```h1``` element:
+
+```css
+<h1 class="pink-text">Hello World!</h1>
+```
+
+### Full solution
+
+```css
+<style>
+  body {
+    background-color: black;
+    font-family: monospace;
+    color: green;
+  }
+  .pink-text {
+    color: pink;
+  }
+</style>
+<h1 class="pink-text">Hello World!</h1>
+```