How to make a curtain for the website?

Good afternoon. Here is a screenshot. It blind that when you open the website active, if you pull up on the button, it gradually opens the block under it, pulling back then gradually hides the block.
Scrolls do not want
There are even videos to Google drive how it works
September 19th 19 at 00:16
1 answer
September 19th 19 at 00:18
codepen.io/thibaudbe/pen/HEwLz
adding events on Drag'n'drop
and here
codepen.io/rhernando/pen/uzDIk
almost what you need

and that's how I did it
codepen.io/Zuraavl/pen/RNBReV
Thank you, if you do not find a ready solution, I will modify it. - darrel_Kozey commented on September 19th 19 at 00:21

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