This page shows custom styling of calendar events using own CSS classes. Define your CSS classes (e.g. in the page attribute CSS - Inline) and use them as the CSS_CLASS column in your SQL query. An example CSS class definition (setting a light-blue background with black border and a dark-blue, bold font) looks as follows.
.fc-event.my-cal-blue {
background-color: lightblue;
border: 0.5pt solid black;
opacity: 0.7;
}
.fc-event.my-cal-blue .fc-title {
color: darkblue;
font-weight: bold;
}