Here is a del ins HTML element CSS snippet that you can use on your website. The deleted text show up with a small placeholder red background that reveals the text on hover and the inserted text is shown on the page with a green background. This should have no issues wrapping multiple lines.
If you are having trouble with the pen, try the archived copy on GitHub
HTML del ins Snippet
See the Pen #codepenchallenge
+ by Mark Praschan (@markpraschan) on CodePen.0