Missing css class MainNoTabs in user center screen

The mainNoTabs class is used when there is no tabs but you need a white background to isolate the main content from the page.

When there is tabs the white background is handled by the tabsContent.

=> remove specific css block:

#viewUser,
#authorizedApplicationsPanel,
#cv_all_saved_searches__panel {
  background-color: #fff;
  border-radius: 3px;
  box-shadow: 0 0 1px rgba(0, 0, 0, 0.1);
  padding: 2em }

=> Use generic mainNoTabs instead.