Styling/Template
It's very likely that the output of tt_news will be different for each site, using a customised template for each one. Therefore, I haven't styled the output, I've simply erased the default CSS by adding the following line to the tt_news TS template:
_CSS_DEFAULT_STYLE >
This removes all the default styling, meaning you can manually add only the CSS selectors required to a separate CSS file (which I would recommend you name tt_news.css), which should be added to the output via an @import statement at the top of the fileadmin/templates/css/main.css file.