How can I add a custom Search Box in my Wordpress posts?

I have a very content heavy website with "profiles" on hundreds of different topics

When a person is reading a post of mine, they will more than likely have other questions or will be interested in reading more about a specific topic

What would be the best way to add a custom search box within my wordpress posts?

Do you know of a plugin that offers that sort of thing?

It would be cool to make it a certain colour to stand out and to be able to add custom text to it.

Thanks

I have used this plugin in the past to accomplish similar functionality and it has worked exactly as needed. I can't remember how much they allow you customize the appearance out of the box, but if you want to send me your c-panel login I would be happy to make a quick styling customization for you if you need me to. Just let me know

Cheers