How can I apply highlight style css on editor mode and preview mode both?

  display: inline-block;
  line-height: 0em;
  padding-bottom: 0.5em;

I applied this css code, but this only applied on preview mode not editor mode. I want to apply this on both. How can I fix this…?

What I’m trying to do

Applying Heading style on preview mode and editor mode both.

Things I have tried

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