HTML colors are specified using a hexadecimal (hex) notation for the combination of Red, Green, and Blue color values (RGB). The lowest value that can be given to one of the colors is 0 (hex 00) and the highest is 255 (hex FF). For example, the color white is equal to #FFFFFF, because it has the highest value for red, green, and blue.
Here is a list of some common HTML color names and their corresponding hex code values:
Black: #000000
White: #FFFFFF
Red: #FF0000
Green: #00FF00
Blue: #0000FF
Yellow: #FFFF00
Purple: #800080
Pink: #FFC0CB
There are also a number of predefined color names that you can use in your HTML code, such as "aqua", "silver", "lime", "maroon", etc. However, it is recommended to use the hex codes instead of the color names, as the names are not supported by all browsers.