Getting a extra space at the bottom, after scrolling a div block up

I had created a sample accordion type on click image,i had scrolled the accordion display div up few pixels and applied zindex (as per the requirement), now i am getting that pixels extra space at the bottom. how can i remove that. Please help me on this.

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Hi, @Saif_D, here your solution:

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@bro-design, thank you soo much. this helps me alot