Cranberry Pomegranate Bellinis with Lime

For the simple syrup:

unsweetened 100% cranberry juice

unsweetened 100% pomegranate juice

sugar

For each bellini:

simple syrup

to 4 ounces Prosecco/champagne (or seltzer)

Squeeze of fresh lime juice

Whole cranberries and slices of lime for garnish, optional