dc9-32,
My understanding :
You run a website. You want to display a cookie warning message on the homepage.
My answer :
Sorry if I'm missing the obvious, but why not just enter the text on there like you would any other update to your website ? Or if you want it to stand out just create a graphic with a coloured background and the text you want ?
Its not rocket science, and you certainly don't need a third party to produce "free HTML code" or anything else for you !