I\'m creating a newsletter, and i want to have panels that change background-color on mouse over.
Seeing as the newsletter wont have a head, I am defining all styles inline.
Have you checked these?
http://www.campaignmonitor.com/css/
http://www.hongkiat.com/blog/design-perfect-newsletter/
The latter article says this:
Hover effects are not supported in Outlook 2007/2010, Gmail, iOS or Android. You may still want to include the a:hover style for all supporting clients: Outlook 2000/2003, Hotmail, Apple Mail, and Yahoo! mail ...
Javascript is a no-go. There is really no solution to this, some will accept :hover, some not. From that first link you can see which will and which will not.
I you are certain your css will not be removed, you can use a hover and a background-color property
.panel:hover {
background-color: #EFEFEF;
}
Also it does not seem possible to use a pseudo-selector in an inline style, so that might be a stopper: