table {
  width: 100%;
  border-spacing: 0;
  border: 2px solid green;
}

thead tr:first-child {
  background: green;
  color: #fff;
  border: none;
}

thead tr:last-child th {
  border-bottom: 3px solid #ddd;
}

tbody tr:last-child td {
  border: none;
}
tbody td {
  border-bottom: 1px solid #ddd;
}

td, th {
  vertical-align: top;
  padding: 10px 15px;
  font-size: 12px;
}

th {
  text-align: left;
}