homework/js09/style.css

table {
  margin: 100px auto;
  box-shadow: 0px 0px 23px -11px rgb(75, 75, 75);
}

td {
  border: 1px solid rgb(175, 174, 174);
  width: 40px;
  height: 40px;
  text-align: center;
}

tr:nth-child(2n) {
  background-color: rgb(240, 240, 240);
}