Scope of tabs is visually unclear

[timhoffm]

Context

The tab content is only bounded by a top and bottom line. It's difficult to associate the bottom line with the end of the tab area.

Example: https://matplotlib.org/stable/devel/development_setup.html#create-a-dedicated-environment

Proposal

The tab scope should be visually more clear.

I suggest to draw a full box, e.g.

which I generated using the (not necessarily best) CSS:

  border-left: 0.0625rem solid var(--sd-color-tabs-underline);
  padding-left: 0.5rem;
  border-right: 0.0625rem solid var(--sd-color-tabs-underline);
  padding-right: 0.5rem;

Alternatively, one could add a background color to the tab content, but this may make consistent color styling harder.

Tasks and updates

No response

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[timhoffm]

Related: pydata-sphinx-theme has added styling for tabs within their theme, which solves this issue on their side: pydata/pydata-sphinx-theme#1555