body{
  padding:30px;
}
$kado:6px;
table {
  border-collapse: collapse;
  overflow: hidden;
  border-radius: $kado;
  position: relative;
  background: #fff;

  &:before, &:after {
    content: "";
    z-index: 2;
    top: 0;
    bottom: 0;
    width: 7px;
    position: absolute;
    border: 1px solid #aaa;
  }

  &:before {
    left: 0;
    border-right: none;
    border-top-left-radius: $kado;
    border-bottom-left-radius: $kado;
  }

  &:after {
    right: 0;
    border-left: none;
    border-top-right-radius: $kado;
    border-bottom-right-radius: $kado;
  }

  tr {
    &:first-child {
      th:first-child, td:first-child {
        border-top-left-radius: $kado;
      }

      th:last-child, td:last-child {
        border-top-right-radius: $kado;
      }
    }

    &:last-child {
      th:first-child, td:first-child {
        border-bottom-left-radius: $kado;
      }

      th:last-child, td:last-child {
        border-bottom-right-radius: $kado;
      }
    }
  }

  th, td {
    border: 1px solid #aaa;
    padding: .6em 3em;
  }

  th {
    background: #ccc;
  }

  td {
    background: #fff;
  }
}