How to change font & size ?

/* Text for most CSS classes */
body, .text, .smText, .error, a, a.smLink, a.msgLink, a.tLink, .WebWizRTEtextarea, .basicTable, .errorTable, .tableRow, .tableTopRow, .tableBottomRow, .evenTableRow, .oddTableRow, .hiddenTableRow, .PMtableRow, .PMmsgBody, .msgBody, .msgEvenTableRow, .msgOddTableRow, .msgHiddenTableRow, .msgOddTableSide, .msgEvenTableSide, .msgSignature, .calDateCell, .calTodayCell, .BBquote, .BBcode {
   font-family: Verdana, Arial, Helvetica, sans-serif;
   color : #000000;
   font-weight: normal;
   font-size: 12px;
   line-height: 1.4;
}