Style ul but exlude menu ul items

Dear GP Team,

I have style all my bullet points on my blog.

I needed to add :

ul:not(.sidebar .widget :last-child) {
    margin: 0;
    padding: 10px 0 30px 0;
}

But while doing so it broke my main nav header alignment menu (some must also contain a ul).

What should I exlude in the not () on my code above?

Would appreciate your help. Thanks a lot.