You’ve started another thread which also can muddle things up. But you haven’t added modlook for staff assistance. So I’ve added modlook as staff will be able to see which (retired) theme you’re using and if you can do what you require with CSS.
Hm, darn. May I suggest one last option, before I back away and leave it to the experts? Please try pasting this snippet into the CSS customizer instead. It will try to override the styling, though it may very well not work, if the original snippet didn’t: