Add a div enclosing on the tables :

<div class="table-overflow"></div>

For the display of tables in responsive mode or very large tables on desktop to be correct, you would have to add this div.

Encoding has been updated : https://code.ametys.org/projects/MAQ/repos/ametys-intranet-search/browse/Code_source/internal-no-img.html (ligne 754)