It’s a very small insect, about a half inch in length. It looks like it’s made mostly of flat wings folded down to the side. (Lake Geneva WI)
Your insect is a planthopper, to be more specifically Acanaloniid planthopper.
Planthoppers are found thru out North America. They feed on plants, but are not pests. They are seen in fields, shrubby areas, on trees or herbaceous plants from summer til fall.
While the adults are green like your little guy, the nymphs are usually brownish,no visible wings with white fluffy ‘tails’ made of wax.
They do not bite or sting.