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I use the x2t theme which has nice buttons, there is Templates in the extras folder of your download for x2t, form buttons are set up like this
For the login block in default theme
class="formButton" calls are made from
system admin->templates->system->system_block_login.html
in the approriate cells of course
code for stylesheet in your theme folder something like this format:
input.formButton {border: 1px solid #5E5D63; color: #000000; font-family: verdana, tahoma, arial, helvetica, sans-serif; font-size: 9px; text-align:center;background-image : url('inputbg.gif');}