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Hexadecimal values go from 0 to F: 0123456789ABCDEF, They start with a hashtag #. and they could be a set of 3 values or 6: #00F is equivalent to #0000FF.
RGBA values contain numbers from 0 to 255 with the alpha parameter that is a number between 0.0 (fully transparent) and 1.0 (fully opaque). example : rgba(255, 0, 0, 0.3) /*red with opacity*/
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If you want to get these values from a webpage on your browser, you can install an extension like colorzilla that will allow you to do so
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You have also online converter if you want