Each widget has styling options. You just need to click on the blue arrow and it will display all the options. You can change the font family, change the color of the title and the content, choose the size or add spacing among other options.
This is how The Converter works: you design in Adobe Muse and you add content in WordPress, which makes it easier for your client to make changes or update their blog.
Usually in Adobe Muse you design the Home page and the layout of the website. Once the template is installed, in WordPress Control Panel you add all the content of the inner pages like contact or about us sections and blog posts.