They look fine here. However, I suspect that you are pasting from a retina/high DPI display. This is really a limitation of how these screenshots work. They are taken at the native resolution of the device (eg, 3840 x 2160) but are then displayed at the CSS resolution of the device (1920x1080), making them appear bigger (technically, 4x bigger) and lower DPI. The problem is that's how big the image actually is and the browser displays it at the native size.