If we add a custom issue icon with bigger resolution size, Scrum board shows it at full resolution. Issue icons should be at 16x16px but if user adds an icon with bigger resolution(like 100x100px) the display of icon becomes at 100x100px.

Steps to reproduce:

• add 100x100px icon to an issue type
• create a scrum board
• configure scrum board as "story" is the base swimlane
• scrum board shows icon at full resolution.

Adding these styles resolves the problem:

.ghx-swimlane-header .ghx-type img