"why 2?" window is cut out on some pages of the installation documentation.

On https://tails.boum.org/install/linux/usb/overview and https://tails.boum.org/install/win/usb/overview/, if the browser is not maximized, the “why 2?” window is cut out on the left and, therefore, hard to read.
note that there is no probleme displaying this window on the page before.

Feature Branch: doc/13333-dont-cut-why-2

Original created by @goupille on 13333 (Redmine)

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