Helppier boundaries of background shading/overlay are not correct.

By default, Helppier uses the padding and borders of the page element to add the shading/overlay around that element so if the element has a large padding Helppier will use it.

Helppier is not using the margin of the element for the background shading/overlay. For example:

Chrome Developer Tools	Helppier

Another example:

Chrome Developer Tools	Helppier

If the boundaries don't match what you need consider selecting a parent (to increase the visible area) or child (to decrease the visible area) of that element.