html, body
{
  width:100%;
  height:100%;
}

body
{
  background:#aaddaa;
}

body.center
{
  text-align:center;
}

table
{
  border-collapse:collapse;
  background:#eeeeee;
}

.center table
{
  margin-left:auto;
  margin-right:auto;
  text-align:center;
}

td
{
  border:1px solid black
}