Change CSS in WP when user is logged in

/* If your theme is correctly using body_class() and a user is logged in, Wordpress adds a class "logged-in" to the body-element, so we can use this in our stylesheet */

/* LOGGED OUT */
.sellertitle {
  float: none;
  width: 49%;
}
.otherseller {
  display: none;
}

/* LOGGED IN */
.logged-in .sellertitle {
  float: left;
}
.logged-in .otherseller {
  display: inline;
}