Hi, unfortunately that didn't work. Instead, it made the image with text overlay to look blurry from the phone view. So I have deleted that code to make the website come back to normality.
When I go to edit code, Asset, I have these settings: theme.css or theme.js (among others, but these two are the most similar to the one you mentioned)
This means that I don't have that configuration you talked about "theme.scss.liquid" within the Asset folder.