Alter only one H1 Tag? How can I do it?

I have a client who has a gigantic site. He was lacking basic SEO on his home page, yet is ranking quite well. He doesn't have an h1 tag on the page, and I want to put it on with the keyword.

However, his css for h1 is a weird gigantic purple mess, and is used on many other pages in the site (so I can't just change the css).

How can I get the keyword in an h1 tag on the home page, but have it blend in better? Preferably altering the size and color, while maintaining the h1 status.

White hat preferably.

Any ideas? Thank you

If you ask that question you should learn CSS and HTML.
Obviously, you add a H1 tag to the homepage, give it a certain class or id and then write your own CSS for that. Keep in mind that you will have to override the CSS rules that will get applied from the global rule of H1.

change the css style so that the h1 is to your liking style wise, simple.

I'm no expert. But I would try giving it an id, so you can refer to it in the css code.
Anyway, if it is indeed a "purple mess", I'd imagine you are not using it anywhere else on the site, so it wouldn't generate any problems changing it.

Took care of it. Just had to change the style within the tag. Looks great, thanks for the help.