I would like to change the color of the current day but only when the calendar is in the day agenda view. My users say they're having a hard time seeing the lines or something. I looked through the documentation as well as the css/js and didn't find a quick way of doing it. Is this even possible without major code changes?
I honestly don't really know what you're talking about, but the jQuery UI fullcalendar widget uses the CSS class .fc-today to style the current day. If your changes aren't visible, try to use !important — it might be that one of the many other classes overrides your styles elsewhere.
If you aren't using a theme, this worked for me using FullCalendar 2.3.1
.fc-unthemed .fc-today {
background: ....;
}
you can use following code
.fc-day-today {
background: #FFF !important;
border: none !important;
}