Responsive Web Design: Added hint to Override Class Declarations with Inline Styles (#21954)

Added hint to Override Class Declarations with Inline Styles (https://guide.freecodecamp.org/certifications/responsive-web-design/basic-css/override-class-declarations-with-inline-styles and https://learn.freecodecamp.org/responsive-web-design/basic-css/override-class-declarations-with-inline-styles)

guide/english/certifications/responsive-web-design/basic-css/override-class-declarations-with-inline-styles/index.md

@@ -3,8 +3,29 @@ title: Override Class Declarations with Inline Styles
 ---
 ## Override Class Declarations with Inline Styles
 
-This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/responsive-web-design/basic-css/override-class-declarations-with-inline-styles/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>.
-
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+We need to use an ```inline style``` to try to make our ```h1``` element white.
+
+### Example
+
+Inline styles look like this:
+
+```css
+<h1 style="color: green;">
+```
+
+### Solution
+
+In this line:
+
+```css
+<h1 id="orange-text" class="pink-text blue-text">Hello World!</h1>
+```
+In opening tag ```<h1>``` we need to add ```inline style``` to make our ```h1``` element white:
+
+```css
+<h1 style="color: white;" id="orange-text" class="pink-text blue-text">Hello World!</h1>
+```
+
+#### Tip: 
+An inline style loses many of the advantages of a style sheet (by mixing content with presentation). Use this method sparingly.