How can I create a sticky checkout bar for easy purchases?

[Agolab]

Hi there. 
There is any app or code to implement to create a sticky checkout bar/button that when clicked brings the customers to the page /checkout to complete their purchase ? 
Thank you 

[Zworthkey]

Hii,
Kindly share your store URL and a screenshot of your problem so,
I can solve it perfectly.
Thank You.

[Agolab]

Hi there. Is not a problem but a request. 
I would like a sticky on the bottom button that goes to the checkout.