/* Скругление первой строки заголовка */
.t431__thead tr:first-child th:first-child {
  border-radius: 20px 0 0 0 !important;
}

.t431__thead tr:first-child th:last-child {
  border-radius: 0 20px 0 0 !important;
}

/* Скругление последней строки */
.t431 tbody tr:last-child td:first-child {
  border-radius: 0 0 0 20px !important;
}

.t431 tbody tr:last-child td:last-child {
  border-radius: 0 0 20px 0 !important;
}