Using CSS, which specifies the appearance of documents written in HTML or XML, you can freely specify the colors of text and pages. In order to specify a color, you need a color name, but looking up the names of 147 different colors can be tedious. In such a case, you can use the web app “Sorted CSS Colors” to intuitively find the color you like and look up the name and color code of that color.
Sorted CSS Colors has been developed as an open source software, and all the code is available on GitHub.