Streamlining the Network Admin Sites Screen

I manage several site. I would like a more streamlined Network Admin Sites Screen.

I would like to add the following style codes:
th#blogname {width: 700px;}
.column-users {display: none;}
.row-actions {display: inline;}

I just don’t know which file contains the associated styles.

The reasoning:
I don’t need to see the user when viewing the sites list. If in need to know the users I’ll click on through to the site’s dashboard.

Adding the width to the blogname allows enough space for the row actions to be on the same line as the blog name, giving each blog a single row. This allows me to see all the sites on a page without having to scroll.