.tram-bao-hanh {
  width: 60%;
  margin: 20px auto;
  border-collapse: collapse;
  font-size: 16px;
}

.tram-bao-hanh th,
.tram-bao-hanh td {
  border: 1px solid #ccc;
  padding: 10px;
  text-align: center;
}

.tram-bao-hanh th {
  background-color: #183f54;
  font-weight: bold;
  color: white;
}

.tram-bao-hanh tr:nth-child(even) {
  background-color: #fafafa;
}