table {
  border-collapse: collapse;
  border: 2px solid gray;
}
thead th {
  border-collapse: collapse;
  border: 2px solid gray;
  background-color: #dddddd;
}
tbody {
  border-collapse: collapse;
  border: 2px solid gray;
  text-align: left;
}
td {
  border: 1px solid gray;
}
th, td {
  padding: 5px;
}
tr.changed {
  background-color: #ffdddd;
}
p.changed {
  background-color: #ffdddd;
}