How to Highlight current date

That would be the best place if the theme support it. Otherwise in any stylesheet the theme is using.

In your case, it was not working because of the way the theme styled the calendar. You can try:

.eo_widget_calendar td.today {
     background: red!important;
}

instead.

That works! Thank you so much and thanks for getting back to me so quickly!

I’m sorry, but one more quick question. How can I make that background color change when someone hovers over it? Thanks!

Try:

.eo_widget_calendar td:hover {
     background: green!important;
}

Thanks! ??