Fix the scrolling when many tasks are added to the list (3)

[KaiWoessner]

The issue arises when the use creates many tasks. The add tasks button is scrolled away no new tasks can be created. The completed tasks list also has this issue.

[KaiWoessner]

Fixed the bug by adding a wrapper around the lists and setting the size to be the expect task area. Then used overflow auto in the wrapper to make the overflow tasks scrollable and disappear when they are outside of the wrapper..