Concatenating all `margin-left` rules. This has 0 byte-saving
impact after gzipping at all, it's just about code style.
Also applying coding convention on media query in 'skin.json'.
Change-Id: Ica8557fcd519dea913fe4c30b1be1bfe0d0919c0
This was inherited from Monobook (r2881, b52a2a1567).
The #mw-panel (sidebar) was at `top: 160px`.
The #p-logo was at `top: -160px`.
This looks hacky so I set #mw-panel `top: 0`.
Bug: T170053
Change-Id: Ifb99ff36e3a9c530c944df2ea0a6c75759045c1c