Remove margin-top from panel when it is first-child

[erikhallaraaker]

All panels have margin-top: 1rem, which is good as panels usually needs some spacing. It is however, unfortunate that the first child also has this margin, as the panel is usually a direct child of a col and that makes it not line up with other content.

I propose to rewrite the panel rule to the following:

.panel {
    &:not(:first-child) {
        margin-top: 1rem;
    }
}

[Akswii]

We see the issue, but this is relates to more than just margin-top for panels. We will need to take a look at how components relate to each other before making a decision.