Sharepoint 2013 - Coloring The Web Part Title Background and changing Font Color

I am not a very experienced coder. I am attempting to change the Announcement web part title to have a background color of black and also change the font color.

I have turned on Content Editor and added the code:

<style>
TR.ms-WPHeader{BACKGROUND-COLOR:#000000}
</style>

If I could get any help with this that would great. Thanks.