Can't you force the width and height values of your submit and reset button by applying a css class like this one :
Water is not bad as soon as it stays out human body ;-)
Code:
.button {
font-family: Verdana;
font-size: 8pt;
background: #333;
color: #F90;
border-style: solid;
border-color: #F5F5F5;
border-width: 1px;
margin-left: 1px;
margin-right: 1px;
margin-top: 1px;
margin-bottom: 1px;
padding-left: 1px;
padding-right: 1px;
padding-top: -1px;
padding-bottom: 1px;
height : 40px;
width : 100 px;
}