How can I highlight specific texts in a banner without using background code?

[jeanzy0910]

Hello, 

I am trying to highlight a specific text in a Shopify banner. I don't want it to be a square background using the background code.

As you can see in my examples, I would like the first picture to be like the second one. The only reason the text is currently highlighted is because I am doing it manually with my mouse lol

Is this even possible?