I noted that Google use web page content when they index pages for SEO purposes. Therefore, what I did was I created the web pages and I used lot of keyword on the web pages. Then I applied the background color to the above keywords to show users.
Question is do they block this kind of pages?
Search Engine Optimization (SEO) is something you really need an expert for these days. The days of having some keywords and meta-data only have long gone, so you need to keep up to date with current SEO tricks to get your site up the Google ranking. You can also check the Alexa rankings for your website.
Take a look at the SEO guidelines from Google here
Take a look at some pointers here and here, but you really need to invest some time and research into the best practices.
You should also make your site as accessible as possible, this will make the site easier to spider, there are some tools here to look at and there's a site here you can use.