.navigation td {
  padding-left: 10px;
  padding-right: 10px;
}

.explore {
  background-color: #cee7f0;
  padding-top: 1px;
  padding-left: 5px;
  padding-right: 5px;
  padding-bottom: 1px;
}

.open {
  background-color: #cee7f0;
  padding: 5px;
  margin: 5px;
}

table.matrix {
  display: inline-table;
  vertical-align: middle;
  border-left: 2px solid black;
  border-right: 2px solid black;
  border-radius: 10px;
  padding: 0 5px;
  text-align: center;
}

table.matrix td {
  padding: 2px;
}