Minimal light: near-black type on warm off-white
Minimal light keeps each panel to two things: a near-black headline in a clean sans, set flush left on warm off-white, and a silver phone so large that the bottom edge cuts it off. With no color competing, the screens themselves carry the set, which suits travel, finance and productivity apps with real content to show.
Make it yours
Swap the frame for black
Frame color is a silver #D8D6D1, which keeps the phone light on a light page. Set it to #161616 for a crisper outline when your own screens are mostly white.
Cool the page down
Background color is a warm #F2F0EB. A cool #EEF1F4 suits fintech and developer tools; keep Text color near black so the headline stays sharp at thumbnail size.