Large white space at top of single event

At the moment, there is a huge gap between the image at the top of the event, and the event content on single event pages (see: https://livingthesheepsheadway.com/ai1ec_event/feile-beag-walking-programme-may-2nd-5th-2014/?instance_id)

I’ve checked for plugin conflicts, and inspecting the code, I can see I need to change ‘relative’ below to ‘fixed.’

.ai1ec-single-event {
position: relative/ fixed;
font-size: 14.3px;
line-height: 22.5px;
}

But when I add that to the main css file, the dates and times misbehave too. Is there any way around this?

All help appreciated!

https://www.ads-software.com/plugins/all-in-one-event-calendar/