_content/tour/static/css/app.css: fix hidden horizontal scrollbar for long outputs

[Sanian-Creations]

This fixes a problem where long outputs go off the screen and the
horizontal scrollbar is not visible (shift-scrolling is currently
possible but this isn't communicated to users), an example is the long
error message when running https://go.dev/tour/methods/9

calc(100% - 32px) fixes that this element stuck out 32px below the
bottom of the page (which hid the scrollbar that was there).
min-width: min-content fixes that this element would have its text
overflow off to the right.

This is a cosmetic fix, there is no bug report.

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Patch Set 1:

(1 comment)

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Patch Set 1:

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Message from Sanian Creations:

Patch Set 6: Code-Review+1

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Patch Set 6:

(1 comment)

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Patch Set 6: -Code-Review

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