-right in your own (WordPress) backyard! I was ready to do a search for a good online hexadecimal color guide for a client, when I realized that they have one right there in the Editing window!
Go to the Dashboard, then select either New or Edit, Post or Page. Any combination will work, but you want to make sure you are in Visual Mode.
Open up the “Kitchen Sink” mode (This is done by clicking that button on the right end of the display that has all those tiny squares), and click the arrow next to the underlined “A” to bring up the Color-Picker.
The initial Color-Picker window contains just a few of the hundreds of colors available. Click on “More Colors” to bring up the full range of options. By default, the window opens to the the full spectrum Picker, but there are other options as well such as the Palette (web-safe colors) and Named Color (standard colors such as “Red”).
Notice how clicking on any point in the palette brings up a series of letters and numbers in the lower right side box? That’s the code you will need to display that color. Choose a few colors and write down their corresponding code. Now, when you want to customize your CSS file, you will have the right code on hand to display the colors you want. (See example below)