asp: buttons appear as HTML input tags (submit button), so you cannot use the same CSS syntax as the hyperlink.
This should work in browsers (except MSIE):
(note: "button" is your class name)
input.button:hover{ color: Green; }
or change all submit buttons:
input[type="submit"]:hover{ color: Green; }
If you use Google for CSS methods to hover over buttons (enter buttons), you'll find some of the best CSS and JavaScript methods.
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