Board Thread:Support Requests - Getting Technical/@comment-27986077-20180627233049/@comment-168424-20180906010209

You really should look at the HTML source for a page rather than guessing the class name...

Anyway, try body.page-Jimin_Solo_Gallery rather than body.JiminJimin__Solo__Gallery (too many underscores).

For Girls'_Genration-Oh!GG/Gallery, it would be body.page-Girls_Genration-Oh_GG_Gallery. All the special characters (including slash) just get turned into underscores, apparently.