Thanks again. Being away for a few days I've just tried change the colour as I wanted and as you suggested. I put the line:
.cpd-dashboard li { color: black; }
at the very end of the "count-per-day/counter.css" file and I tried to change the #777 into #000000 here
.cpd-dashboard li {
color: #777;
padding-bottom: 2px;
border-bottom: 1px #ddd dotted;
overflow: hidden;
}
but it wouldn't work.
Maybe I misunderstand something quite easy because I'm German. Anyway I thought it would be easier to change colours here which it probably is. Thanks for your help. I think I'll give up.