产品图片，png，在某些页面上不透明，Nova主题，bigcartel

i need help. 1) Products images, png, are not transparent on a products page but they are on a single product page. And they are ok on a stacked products layout but not on a grid. And we need grid layout. You can choose grid or stacked layout in the theme settings. (Nova theme) 2) Also on flexslider. This is also important to us because we want to play with various frames and we need that transparency.. I spent days researching this and found no solution, my head is full and confused. Can you help?i need help. 1) Products images, png, are not t