body {
  margin: 20px;
  font-family: Arial, sans-serif;

}

.center{
  text-align: center;
}

table{
  width: 100%;
  border-collapse: collapse;
}

th, td {
  border: 1px solid #ddd;
  padding: 8px;
}

th {
  background-color: #f2f2f2;
}