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[Beverleyh]

and I am kind of sure that i am using right elements

Try using the developer console – F12 in most browsers.
If you inspect the element that you’re trying to target, you should be given the element selectors needed for your CSS over in the “style” pane.

Try not to use !important overrides if you can because it makes maintenance difficult. Instead, increase the specificity of your target selector – e.g.;

.element { /* styles */ }

body .element { /* I'm more specific */ }

Sometimes using !important is OK – here’s a discussion to help you decide https://css-tricks.com/when-using-important-is-the-right-choice/