form {
  margin: 0 auto;
  width: 205px;
}

table {
  border-collapse: collapse;
  margin: 0 auto;
  margin-top: 50px;
}

td {
  border: solid 2px black;
  height: 150px;
  width: 150px;
}

table tr:first-child td {
  border-top: 0;
}

table tr:last-child td {
  border-bottom: 0;
}

table tr td:first-child {
  border-left: 0;
}

table tr td:last-child {
  border-right: 0;
}

.xo {
  padding: 15px;
  padding-bottom: 13px;
}