SharePoint 2010 CSS Chart

CSS	Comments	Screenshots
body #s4-ribboncont{background-image:none;}	/*Globally turning off bordersThis is needed to have any of the style below to take effect.
.ms-cui-groupSeparator {border-right:1px solid #E7E7E8 !important; }.ms-cui-topBar2{border-width:0px;}*/	/*Turn on separators in the Ribbon
.ms-cui-ribbonTopBars{background: red url() repeat-x !important; padding-top:0px; }	/* Set the background for the tabs at the top (Browse / Page) */
.ms-cui-cg-i{background-image:url() !important; background-position:bottom left; background-repeat:no-repeat !important; height:15px; margin-bottom:2px; } .ms-cui-cg-db .ms-cui-cg-t{height:17px; background-image:url(‘http://integration.echn.ca/Media/SiteImages/bgBackground.gif’) !important; background-position:bottom right !important; background-repeat:no-repeat !important; margin-left:4px;} .ms-cui-cg-t-i{ color:white; font-weight:bold; } .ribbon-wrapper{position:relative;}	/* Set the background for the additional dynamic tabs (Web parts / Lists etc.) */
.fixed-ribbon{position:fixed; top:0; width:950px; z-index:21;}
.s4-title{height:34px; background: red url() repeat-x; }
.s4-title h1 a,.s4-title h2 a,.s4-title h2 {color: red;}
.s4-title .s4-pagedescription,.s4-title .s4uniqpermdescription {color:red;}
.ms-cui-tt-s .ms-cui-tt-a {color:red !important; background: red url(); }
.ms-cui-tabBody{background:red url(); }	/* Set the background of the Tab Body */
	The next section changes the style one of the additional tools menu items. There are several in the Corev4 CSS to change.
.ms-cui-cg-db .ms-cui-cg-t{color: red; background:url(“/_layouts/images/bgximg.png”) repeat-x -0px -834px; }	/* Font color of the Library Tools and background using bgximg.png offset by -834px */
.ms-cui-cg-db .ms-cui-tt-a:hover {border-color: red; border-top-color:red; background:url(“/_layouts/images/bgximg.png”) repeat-x -0px -834px; }	/*Borders and background of Library Tools when menu is not selected.
.ms-cui-cg-db .ms-cui-cg-i{border-color: red;}	/* Border above library tools when not selected*/
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-cg-i{border-color: red;}	/* Border above library tools when sub-menu item selected*/
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-ct-ul{background-color: red; border-color: red; }	/* Gap between menu items in the Library Tools when sub-menu item selected */
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-cg-t{color: red; background:url(“/_layouts/images/bgximg.png”) repeat-x -0px -834px; }	/* Background of Library Tools when sub-menu item selected */
.ms-cui-cg-db .ms-cui-ct-first .ms-cui-tt-a{border-left-color: red;} .ms-cui-cg-db .ms-cui-ct-last .ms-cui-tt-a{border-left-color: red;}	/*Borders of the Library Tools when Browse tab selected*/
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-ct-first .ms-cui-tt-a{border-left-color: red;}	/* Border color on the first sub-menu item when selected*/
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-ct-last .ms-cui-tt-a{border-right-color: red;}	/* Border color on the last sub-menu item when not selected*/
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-tt-s .ms-cui-tt-a{border-left-color: red; border-right-color: red;}	/* Border color on the last sub-menu item when it’s selected*/
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-tt-a{border-color: red; border-top-color:red; background-color:red; }	/*None selected sub-menu item*/
.ms-cui-cg-db.ms-cui-cg-s .ms-cui-tt-a:hover{background-color: red !important; border-top-color: red;}	/*Library tools none selected sub-menu item on hover */
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-cg-t{ color:#0e400d; background-color:red; background-image:none; }
.ms-cui-cg-gr .ms-cui-tt-a:hover{ border-color:#56c553; border-top-color:#56c553; background:red; }
.ms-cui-cg-gr .ms-cui-tt-a:hover{ border-color:red; border-top-color:red; background:url(“/_layouts/images/bgximg.png”) repeat-x -0px -832px; }
.ms-cui-cg-gr .ms-cui-ct-last .ms-cui-tt-a{ border-right-color:red; }
.ms-cui-cg-gr .ms-cui-ct-first .ms-cui-tt-a{ border-left-color:red; }
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-cg-t{ color:#0e400d; background-color:red; background-image:none; }
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-tt-a{ background-color:red; border-color:#56c553; border-top-color:#56c553; }
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-tt-s .ms-cui-tt-a:hover{ border-color:#03a200; background-color:red !important; }
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-tt-a:hover{ background-color:red !important; border-color:#56c553; border-top-color:#56c553; }
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-tt-s .ms-cui-tt-a{ border-left-color:red; border-right-color:red; }
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-ct-last .ms-cui-tt-a{ border-right-color:red; }
.ms-cui-cg-gr.ms-cui-cg-s .ms-cui-ct-ul{ background-color:red; border-color:#03a200; }
	/*Start of the Browse menu formatting.*/
.s4-tn {background:red url();}	/*Menu Bar background*/
.s4-tn li.static > a:hover{/* [ReplaceColor(themeColor:”Accent1″)] */ color:red;}	/*Browse none selected menu items on hover */
.s4-toplinks .s4-tn a.selected:hover{color: red;}	/*Color of selected menu item on hover event.*/
.s4-toplinks .s4-tn a.selected{border-color: red; border-bottom-color: red; border-top-color: red; background-color: red; }	/*Border and Background of selected menu item.*/
	/*Start of the Main Area formatting.*/
body #s4-mainarea.s4-pr{background: red url();}	/*Below the Ribbow half of the page.*/
.s4-ca.s4-ca-dlgNoRibbon{background: red url();}	/*Behind the Main Content*/
body #s4-leftpanel-content{background: red url(); }	/*Background of the Left Panel*/
.s4-specialNavLinkList{background: red url();}	/*Background of the navigation link list on quicklaunch*/
body #s4-leftpanel-content{ padding:0px 0px 0px; border:1px solid #ffffff; border-top-width:0px; border-right-width:1px; border-bottom-width:0px; border-left-width:1px; }	/*Border of the quicklaunch*/

To help find additional styles in corev4.css please see this post on using the IE8 Developer Tools.

It will help you identify all the CSS that is affecting a selected region.