When used correctly, colours can not only enhance the visual appeal of your website but also help in conveying your message to the target audience effectively. Modern web browsers share 216 common colours necessitating you to stay in this colour range while designing key elements.
Going outside the standard 216 colour pallet would require the browser to mix colours. The browser thus borrows tiny dots from the colours that already exist to create the required colour, a process that is called as dithering. Most of the times, this dithered colour is so speckled that it becomes impossible for users to read the text.