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Your WordPress blog posts may receive a large number of comments, and your response to these comments may be lost in the conversation. This article demonstrates how to use a distinct color to indicate the author of a blog post’s response or comments in a thread. To add customized CSS  to highlight author comments in WordPress, follow these steps:
  1. Log in to WordPress as the administrator.
  2. On the Dashboard in the left sidebar, click Appearance, and then click Customise:
  3. On the theme customization options, click on the “Additional CSS”:
  4. Insert the custom css code to highlight author response in the comment section (under blog post) in the customizing Additional CSS section: