Issue Summary

When completing a sprint, the background color of the bar/lozenge changes to the same as the month column and becomes unreadable

Steps to Reproduce

1. Go to a Scrum board and create a sprint with a starting date set for before the month we are currently in and an end date during the month we are currently in so that the bar goes across months.
2. Start the sprint and check the Timeline,. you will see the Sprint bar/lozenge is blue and contrasts against the gray of the current months column:
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3. Complete the sprint.
4. Go back to the Timeline and check the sprint visualization.

Expected Results

The completed sprint bar/lozenge is easily readable, allowing us to see the approx. date from a glance.

Actual Results

The sprint bar/lozenge's background is the same color as the current month column's, making it impossible to read.

Workaround

Clicking over the sprint lozenge to be able to see the actual dates.