BaseTabs:Breaking out of container margin

Build 1276 on dzucconi/feat/theme-v3
1200px
Reviewing disabled
The baseline is shorter than the new snapshot (1168x38 to 1168x126).
Baseline History
Build 127641e10b3
Current build. There are unaccepted changes, so build 1241 is still the baseline.
Build 1143a3aa23a
Accepted by Damon.
Commenting is disabled because there's a newer build on this branch