Apart from copying colors from the CSS code of the elements when inspecting with CSS Pro, there are also 2 big features you can use to copy colors from websites:
Fell in love with a color you saw somewhere? Use Pro's color eyedropper - it works even if it's an image.
Point and click to get the color you're seeing.
You can easily open the Color Eyedropper by using the shortcut Option+Shift+E on Mac or Alt+Shift+E on Windows/Linux - even if CSS Pro is currently not opened on the tab.
Or you can also open it by clicking on "Color eyedropper" on the top bar.
It's simple: just hover your mouse over the color you want to copy, and click on it.
Analyze the entire palette of colors from a website in a second. Find the color you like, and just click on it to get its syntax.
Open it by clicking on "Color Palette" on the top bar.