A little advice about the UI

[SONGjiemo]

1、The anchor point on the left adds an outline background. Embellish it like this

2、The text is spaced up and down, which is a bit tight at the moment. I want to be able to set the spacing between the top and bottom of the text.

3、Support Markdown syntax, I installed the Markdown plugin, you can see the Markdown effect in the article editing interface. But the preview interface doesn't. I'd like to support Markdown plugins or wp themes