Ensure consistent size on cluster view

This is likely only possible via Flexbox or CSS Grid (I haven’t though through how I would do it). If you complete a system it draws a green border around it. This accentuates system “size” differences (number of rows of text in the label).

For example, see: https://exploitzeroday.com/cluster/6/

Also, a 1px padding will be required to complete this effect.

We’ve got a styling overhaul planned, probably as part of Alpha 1. As part of that, we’ll be dealing with this issue.