table {
  border-collapse: separate;
  border-spacing: 1px;
  border-radius: 10px;
  border: 1px solid black;
  overflow: hidden; /* Clips row background colors */
}

/* Add internal gridlines manually without breaking outer corners */
th:not(:last-child), td:not(:last-child) {
  border-right: 1px solid black;
}

tr:not(:last-child) td, tr:not(:last-child) th {
  border-bottom: 1px solid black;
}