I use a dropper to select colors when I am designing on line but I do not have a way to find the exact color I am looking for. Here is just one place where you can find the color by name and not just have to rely on your own vision. Not all computer screens show the exact colors but when you have a name to go with the code you can be sure you are in the right area.
w3schools.com for this information
147 color names are defined in the HTML and CSS color specification (16 basic color names plus 130 more). The table below lists them all, along with their hexadecimal values.
Tip: The 16 basic color names are: aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow.
HTML Color Names