Flutter BottomNavigationBar remove default paddings - flutter

I am using BottomNavigationBar with icon and label property. Now I want remove icon top and label bottom paddings. How can I do this?

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Flutter , keeping container of a ListView on the top of the screen when scrolling down

how to keep a specific container of a ListView on the top of the screen when scrolling down?
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list item 2
....
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You have to work with SliverList and SliverAppBar to achieve a layout like that.
Read more about it in this article.

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https://material.io/design/components/app-bars-bottom.html#behavior