Three problems (Feature image background,Faeture image size,and footer widget)

I am facing three problems
first is feature image background not transparent it always show black which look weird.
Second is featured image have different sizes on homepage how to scale or automatic to one dimension.
Third is Footer widget if i want to add two widget one is most bottom left corner and other bottom right corner but it not worked.(i added three widget…two visible and one is hidden between them).If you dont add footer widget in 2nd and 3rd footer option then even it displays footer together.

My website :