CSS in Aware is usually not a 1 fix thing to fix all but if you already have a working CSS change but it messes up other things, the easiest thing you can do to fix this is to make your CSS class more specific so it only targets the queries you want.
If you have the following class now:
.k-toolbar
{
height: ....
}
All you have to do is add another part to the class like this:
.k-toolbar .MySpecificQuery
{
height: ....
}
And then you add "MySpecificQuery" to the class field on the queries where you want to apply the change.
