Suggestion: Add a Color Popup with RGBA Slider

[desktopofsamuel]

Hi Thank you so much for building ScreenGuru, I'm a regular user, may I suggest a feature here that it would be great if the background color can be picked more intuitively? Oftentimes, I want to match a slightly lighter / darker background color with the screenshot, if the hex input can also support a color picker popup like Chrome does, this would save users some time opening another color tool to find the hex code.