body {
  margin:auto;
  font-family: Arial, Helvetica, sans-serif;
  font-size: larger ;
}

.cell {
  border-right: none;
  border-bottom: 2px solid darkgrey;
  display: table-cell;
  padding: 6px;
  vertical-align: middle;

}

.cellheader {
  border-right: 1px solid white;
  display: table-cell;
  padding: 1px;
  text-align: center;
}

.center {
  text-align: center;
}

.table {
  border: 0;
  display:table;
  margin: auto;
  width: 90%;
  max-width: 800px;
}

.table>div:first-child{
  border: 1px solid darkgrey;
  background-color: darkgrey;
  color: white;
  display:table-row;
  font-weight: bold;
}

.table>div:not(:first-child) {
  border: 1px solid darkgrey;
  display:table-row;
}