body {
min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center; /* Vertical center */
  align-items: center;    /* Horizontal center */

  /* Your existing styles */
  margin: 0 auto;
  max-width: 40em;
  padding: 0 1em;
  font-family: 'Iowan Old Style', 'Palatino Linotype', 'URW Palladio L', P052, serif;
  font-weight: normal;
}

header {
  line-height: 1.3;
  width: 100%;
  margin: 1em auto 0.2em;
  border-bottom: solid green;
  text-align: center;
  }
  
 header h1 {
	line-height: 1.2;
	margin-bottom: 0.2em;
}

header p {
	margin-top: 0;
	margin-bottom: 0.5em;
}

main p:first-child {
	margin-top: 0.8em;
}