Calendar CSS

[Front Range 4x4]

Simple question that has me stumped.

What controls the red highlight for "today" on the monthly calendar. I appear to have eliminated it and can't figure out how to bring it back.

TIA!

[Front Range 4x4]

Answering my own question:

Added in Additional CSS

#highlight {background-color:yellow; padding:0px; border:3px solid black; font-weight:bold }
#calendar_today {background-color:yellow; font-size: 130%; font-weight:bold;}
.daybox {padding:0px}
#calendar_date {font-size: 115%;}