The events consist of two nested divs which are marked with the following CSS classes
.month_default_event
.month_default_event_inner
All default styling is applied to the inner div. You can apply margins by overriding the "left" and "right" styles of the inner div:
body .month_default_event_inner {
left: 5px;
right: 5px;
}
(Please create new topics for new questions in the future - thanks ;-)