i want to know does crystal reports allow css style

in my report in there is a sunday on 1st it should show yellow colr ...

And am making a report for a month so it will give me days til 31 ...

and i have a table in backend which gives me the details of holidays occuring in january month ..so if there is a sunday on 1,7,16,21 this should be yellow marked ..my 1,2,...31 are headers in my report

if i cant do this ...

i can use 1* which will indiciate * as holiday thru backhand
..but the problem is that if 1* is not a holiday in feburary it wont bind it !

soooo :**
so which should i use