Hi,
First I think that you should change the settings of the option 'Add to cart popup size' in Configuration > Main > Cart to use the height of "220".
Then in your file "/media/gantry5/engines/nucleus/css-compiled/nucleus.css" there is the property:
#g-page-surround {
min-height: 100vh;
position: relative;
overflow: hidden;
}
So the "min-height: 100vh;" is the css which is forcing the height of the content, so a scroll bar is displayed.
You can remove this property or add the following one at the end of this css file:
#g-page-surround {
min-height: auto;
}