The reason it’s showing up like that is because the markup is different in the Genesis 2.0 version. You could add this to your css and it would add a white background around the entire post and widget title –
.featuredpost {
background: #fff;
padding: 20px 40px;
}
Then you would need to remove the box-shadow from the .entry on line 2197 in your css if you don’t want to use it.