Match tag colors

Hi my name is Ben. I’m using the free web version and this is going to sound like a really basic question. How do I EASILY match tag colors. I know how to set a tag color but if I have tags with different colors and I want to make them the same color what is an easy way to identify the color for matching. At the moment I’m going to the color that looks like the closest match and then select it and see if it’s the right color, if not I keep repeating this until I eventually get the correct color match. I know this sounds like a basic question but the elimination process is time consuming and tedious there has got to be an easier way to do this.