.wp-list-table .manage-column.column-slug{
    width: 15%;
}
.wp-list-table .manage-column.column-status{
    width: 7%;
}
.wp-list-table .manage-column.column-count{
    width: 5%;
}
.wp-list-table .manage-column.column-featured{
    width: 8%;
}
.wp-list-table .manage-column.column-url{
    width: 15%;
}