ul li image from theme css

Greetings,
Trying to figure out how to remove the ul li imgage from the posts without removing them from the themes css. And is there a way to override the plugin css?

Any help would be appreciated…..

The plug is in at the bottom of the page:
http://www.mybusyhealthylife.info/

https://ww.wp.xz.cn/plugins/wp-frontpage-news/