Whilst changing colour individually is nice, the default text is the problem here.
Perhaps you can mention to Alex that he needs to change line 39 in the file called
kunena.default-min.css
From this:#Kunena div.kcontainer table.kmsg td.kmessage-left div.kmsgbody {
color: #9F9F9F; font-size: 14px; margin-left: 20px; margin-top: 15px;}
To this:#Kunena div.kcontainer table.kmsg td.kmessage-left div.kmsgbody {
color: #EEEEEE; font-size: 14px; margin-left: 20px; margin-top: 15px;}
That will change the default body text in the posts for the entire forum to a darker grey.
I still need to find where the input/reply box is set up, but that may cover it anyway