Cover CSS hide TinyMCE invisible tables

[agnogueira]

bootstrap.min.css from Cover have this line:
.invisible{visibility:hidden;}

TinyMCE has this amazing class to remove table border:

So all the tables desapear...
Maybe a line like that in cover.css could solve the mess:
table.invisible{visibility:visible;}

What you think?

[hvelarde]

@Quimera is MIA, @agnogueira

if we need to fix this, we need to fix it.