body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  padding: 20px;
  display: flex;
  justify-content: center; /* căn giữa theo chiều ngang */
}

.container {
  max-width: 900px;
  background: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
  color: #006699;
  margin-bottom: 20px;
  text-align: center;
}

p, li {
  line-height: 1.6;
  text-align: justify;
}

ul {
  padding-left: 20px;
}

.highlight {
  font-weight: bold;
  margin-top: 20px;
}