Thanks for writing in! Please be advised that css can only be use to change the color, font and other property on the element. What you will need is a custom php code that will change the display output for the blog post title and the author name.
Please see this related thread:
As this is all custom development, regretfully we might not be able to assist further. Custom development is outside the scope of our support. We will be happy to provide advice and get you started in the right direction, but you would still be responsible for the implementation.
Please let us know how it goes.