table.prettytable {
  margin: 1em 1em 1em 2em;
  background: #f5f5f5;
  border-collapse: collapse;
}
table.prettytable th, table.prettytable td {
  border: 1px silver solid;
  padding: 0.2em;
  text-align: center;
  font-size: smaller;
}
table.prettytable th {
  background: #dcdcdc;
}
table.prettytable caption {
  margin-left: inherit;
  margin-right: inherit;
}