Add the following to your HTML's HEAD element:

<style type="text/css">

.user_table {
   border-collapse: collapse;
   border:          solid 1px;
   padding:         0;
}

.user_row {
   border:          solid 1px;
}

.user_firstname_cell,
.user_lastname_cell,
.user_state_cell,
.user_country_cell {
   border:          solid 1px;
   padding:         0;
   width:           140;
   text-align:      center;
}

</style>
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Reference

Updated