Bug: List of exercises does not display correctly on smartphone

[yurug]

Related user(s):

No response

Related issue(s) or PR(s):

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Related project scope(s):

web-app UI

Bug description:

When I list the list of exercises (for instance on the static public instance of learn-ocaml) on my smartphone, the layout seems broken. See attached screenshot.

To reproduce:

1. Go to https://ocaml-sf.org/learn-ocaml-public/#activity=exercises
2. Put your browser in smartphone-like display (using the developer tools as available on Firebox or Chromium typically)

Expected behavior:

No response

learn-ocaml --version

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git describe --long --always --abbrev=40 --tags

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What OS do you use?

other

What OS version/distribution do you use?

Android

What browser(s) do you use with learn-ocaml?

other

What browser(s) version did you used to reproduce the issue?

No response

Screenshots (if need be):

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Additional context:

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