Hi Wolfgang,
Thank you for your help, it works fine.
Fabrice

2015-09-08 20:24 GMT+02:00 Wolfgang Schuster <schuster.wolfgang@gmail.com>:
8. September 2015 18:29
Hi,
@Otared I accept your answer until I can not fix my code, thank you.
A better solution is to increase the space before each environment because the part of the title which sticks out of the box does not exist for TeX.

Changing the before value to “before={\blank[line,halfline]}” should be enough.
@Woffgang  I have to change the code (how ?) because I realize that the text of the second environment exceeds the frame (if you draw it).
Add

    maxwidth=\availablehsize,

to your column setup.

Wolfgang

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