Editing the "Just added to your cart" popup

Hi,
I’ve scouted a lot of different Shopify stores and seen that some of them change their “add to cart” process to skip the cart page and only use the “Added to your cart” popup to get the user to the Checkout.
I’m hoping to accomplish this as well. My website is www.checkoutfirst.com

Please see the screenshot I attached. My site is the first example (with the “view cart”).
I’d like my site to be like the second example (with “Checkout” button instead of “view cart”)
Can someone please provide the button code to make the modification? (and the button as a solid color instead of white.)
And also please let me know where the file is located for this popup, so I can add some custom content… images, etc.

@checkoutfirst ,

Welcome to the shopify community.

Surely we will help you but it is time consuming task you can do it by yourself if you are having coding knowledge.

solution will be for all the device. we will give me best one.

explain your requirement by chat. its a best way to communicate. you can get connect me on Skype or via email.

It is written below!

Thanks.