When i go to >Admin>Site Settings>StylesheetEditor

How to change the color on the head page with the CSS

can i have a example to have header and bottom blue  on css please

actually we have :

================================

CSS STYLES FOR DotNetNuke
================================
*/   
/* PAGE BACKGROUND */
/* background color for the header at the top of the page  */
.HeadBg {
}
/* background color for the content part of the pages */
Body
{
}
/* background/border colors for the selected tab */
.TabBg {
}
.LeftPane  { 
}
.ContentPane  { 
}
.RightPane  { 
}
/* text style for the selected tab */
.SelectedTab {
}
/* hyperlink style for the selected tab */
A.SelectedTab:link {
}
A.SelectedTab:visited  {
}
A.SelectedTab:active   {
}
A.SelectedTab:hover    {
}
/* text style for the unselected tabs */
.OtherTabs {
}
/* hyperlink style for the unselected tabs */
A.OtherTabs:link {
}
A.OtherTabs:visited  {
}
A.OtherTabs:active   {
}
A.OtherTabs:hover    {
}
/* GENERAL */
/* style for module titles */
.Head   {
}
/* style of item titles on edit and admin pages */
.SubHead    {
}
/* module title style used instead of Head for compact rendering by QuickLinks and Signin modules */
.SubSubHead {
}
/* text style used for most text rendered by modules */
.Normal
{
}
/* text style used for textboxes in the admin and edit pages, for Nav compatibility */
.NormalTextBox
{
}
.NormalRed
{
}
.NormalBold
{
}
/* text style for buttons and link buttons used in the portal admin pages */
.CommandButton     {
}
/* hyperlink style for buttons and link buttons used in the portal admin pages */
A.CommandButton:link {
}
A.CommandButton:visited  {
}
A.CommandButton:active   {
}
A.CommandButton:hover    {
}
/* GENERIC */
H1  {
}
H2  {
}
H3  {
}
H4  {
}
H5, DT  {
}
H6  {
}
TFOOT, THEAD    {
}
TH  {
}
A:link  {
}
A:visited   {
}
A:active    {
}
A:hover {
}
SMALL   {
}
BIG {
}
BLOCKQUOTE, PRE {
}
UL LI   {
}
UL LI LI    {
}
UL LI LI LI {
}
OL LI   {
}
OL OL LI    {
}
OL OL OL LI {
}
HR {
}
/* MODULE-SPECIFIC */
/* text style for reading messages in Discussion */    
.Message    {
}   
/* style of item titles by Announcements and events */
.ItemTitle    {
}
/* Menu-Styles */
/* Module Title Menu */
.ModuleTitle_MenuContainer {
}
.ModuleTitle_MenuBar {
}
.ModuleTitle_MenuItem {
}
.ModuleTitle_MenuIcon {
}
.ModuleTitle_SubMenu {
}
.ModuleTitle_MenuBreak {
}
.ModuleTitle_MenuItemSel {
}
.ModuleTitle_MenuArrow {
}
.ModuleTitle_RootMenuArrow {
}
/* Main Menu */
.MainMenu_MenuContainer {
}
.MainMenu_MenuBar {
}
.MainMenu_MenuItem {
}
.MainMenu_MenuIcon {
}
.MainMenu_SubMenu {
}
.MainMenu_MenuBreak {
}
.MainMenu_MenuItemSel {
}
.MainMenu_MenuArrow {
}
.MainMenu_RootMenuArrow {
}