Style sheet

<apex:stylesheet value="{!URLFOR($Resource.myStyles, 'newStyles.css')}"
/>

• Theme1—Obsolete Salesforce.com theme
• Theme2—Salesforce.com theme used prior to Spring '10
• PortalDefault—Salesforce.com Customer Portal theme
• Webstore—Salesforce.com AppExchange theme
• Theme3—Current Salesforce.com theme, introduced during Spring '10


http://wiki.developerforce.com/index.php/Using_the_Salesforce_CSS_in_Your_Apps


<apex:page standardStylesheets="false">
<!-- page content here
-->
</apex:page>