body{background-color:#408b40;}

table.t3{margin:0.7em auto;
          background-color:#ffc78f;}

table.t33{margin:0em auto;
          background-color:#f0fff0;
          border:none;}

table.t2{margin:1em auto 0em;}

<style type="text/css">
div.atable{text-align: center;
           width:700; font size:3;}
div.atable table{margin: auto;
                 text-align: left;}

<style type="text/css">
div.btable{text-align: center;
           width:600; font size:3;}  
div.btable table{margin: auto;
  border:2px solid; text-align:left;}

table.noveltable th,
table.noveltable td{border:1px solid;}