how to remove outline of html button

Use this:

input[type="reset"]:focus{
    outline: none;   
}

or just

input:focus{
    outline: none;   
}

if you don't want that outline to all the input types.

Just add display: block;

.resetButton
{
    margin: 0px;
    background:url(../images/button/Reset2.png) no-repeat;
    display: block;
    border: none; 
    width: 90px;
    height: 32px;
    cursor: pointer;
}