Check the colors used on the site "mooColorFinder"
It is a net service that analyzes the CSS file of the specified site and shows the automatically used color like a palette. Since the thumbnail image (small image) of the site itself is also displayed at the same time, it seems to be useful for web design when referring to some site.
For details on how to use etc. From the following.
MooColorFinder - retrieve all website colors
Enter the address of the site you want to analyze and click "get me the colors!"
Then the color palette at the top and the preview at the bottom are displayed