docs: ensure consistency in example for class-and-style.mdIn the inli…

…ne style are it was written 13 px instead of 30px for the font size. I re write it to 30px (#2007) (#2008)

* fix: align play icon (#2818)

* align play icon
* fix center horizontally

* docs: ensure consistency in example for class-and-style.md (#2822)

In the inline style are it was written 13 px instead of 30px for the font size. I re write it to 30px

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Co-authored-by: Raz Luvaton <[email protected]>
Co-authored-by: Anoop B K <[email protected]>

src/guide/essentials/class-and-style.md

@@ -296,7 +296,7 @@ CSS プロパティのキーにはキャメルケース（camelCase）が推奨
 ```js
 const styleObject = reactive({
  color: 'red',
- fontSize: '13px'
+ fontSize: '30px'
 })
 ```