table {
  border-collapse: collapse;
}

table, th, td {
  border: 1px solid black;
}

th, td {
  min-width: 8em
}

th {
  background-color: LightBlue
}

.exception {
  background-color: PaleVioletRed 
}

.diff {
  background-color: Gold
}

.problem {
  background-color: HotPink
}

.open {
  background-color: #F88
}

.good {
  background-color: #BFB
}