fix(guide): restructure curriculum guide articles (#36501)

* fix: restructure certifications guide articles
* fix: added 3 dashes line before prob expl
* fix: added 3 dashes line before hints
* fix: added 3 dashes line before solutions

guide/english/certifications/front-end-libraries/react/add-inline-styles-in-react/index.md

@@ -1,10 +1,18 @@
 ---
 title: Add Inline Styles in React
 ---
-## Add Inline Styles in React
+# Add Inline Styles in React
+
+---
+## Problem Explanation
 You can declare a component style passing the object directly as a prop 'style'. Just remember that each property of the style object is camelcased. So properties like 'font-size' is declared 'fontSize' to be a valid javascript object property.
 
-### Spoiler
+
+---
+## Solutions
+
+<details><summary>Solution 1 (Click to Show/Hide)</summary>
+
 ```jsx
 const styles = {
   color: 'purple',
@@ -23,5 +31,6 @@ class Colorful extends React.Component {
 };
 ```
 
-### Resources
+#### Relevant Links
 [DOM Elements Style](https://reactjs.org/docs/dom-elements.html#style)
+</details>