Incorrect placement the arrow in the schedule details popup

[jungeun-cho]

Describe the bug

A clear and concise description of what the bug is.

To Reproduce

Steps to reproduce the behavior:

1. In the weekly view (default: 'week')
2. Make a long schedule.(e.g. 04/27 00:30 ~ 23:00)
3. The category of schedule is 'time'. (category: 'time')
4. Click this schedule.
5. Scroll down and check the placement of the detail popup.

Expected behavior

Do not overflow the container.

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