Update README.md

README.md

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 # Heading Level Indent
 
-*Indenting content under headers based on their level* is a visual technique to create a visual hierarchy that makes it easier to understand the structure and organization of your document and facilitates the application of **selective attention** on specific structure part. 
+**Indenting content under headers based on their level** is a visual technique to create a visual hierarchy that makes it easier to understand the structure and organization of your document and facilitates the application of **selective attention** on specific structure part. 
 
 - For now, it is only awailable in reading view
 - You can specify the margins for the content of each heading in plugin settings
 - Also you can add your own custom css to the headings and their content, using the classes `data_h1/2/3/4/5/6` and `heading_h1/2/3/4/5/6` appended to each rendered section in reading view
 
+## Preview
+
 ![plugin_preview](https://user-images.githubusercontent.com/58810368/220870821-1d7adf75-d6c8-4f6e-9634-5f10b34cfe95.png)
 
 ## Install