figure img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* Styling of tables */
table {
  border-collapse: collapse;
}

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

th {
  background-color: #4CAF50;
  color: white;
}

tr:nth-child(even) {background-color: #f2f2f2;}

h1 {
  font-size: 31px;
}

h2 {
  font-size: 22px;
}