Underline issues with some elements in text

I added to my custom css file a rule that all links should be underlined as follows:

#top >a {
    text-decoration: underline!important;
}
#top >a strong {
    text-decoration: underline!important;
} 

This works fine in pages. However in text fields present in posts or portfolio the rule is not applied. Inspecting at the rules applied I see that a rule on base.css overwrites my custom rules:

#top a:where(:not(.wp-element-button)) {
	text-decoration: none;				/*	WP 6.1 fix   */
}

I added then in my custom rule a new one:

 #top a:where(:not(.wp-element-button)) {
	text-decoration: underline!important;
}

But this new rule doesn’t affect the whole post page. I tried to clear cache, both from my browser and from the server, but the base.css rule still overwrites my custom rule.
How can I fix it? Thanks

• This topic was modified 10 months, 3 weeks ago by elenapoliti.