Thanks, it's work with descendant combinator 🙂
I add this on my css style:
.mode_revisions #dokuwiki__content { max-width: 100% !important; }
I see there are the same thing for mode edit, etc... So I can make what I want !
Edit : and more logical : just declare all #dokuwiki__content with the max width, then use "mode_show" for the article:
#dokuwiki__content {
max-width: 100% ;
}
.showSidebar .mode_show #dokuwiki__content, .mode_show #dokuwiki__content {
max-width: @ini_article_width;
min-width:30em;
}