body {
  margin: 0;
  padding: 0;
  font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}

main {
  max-width: 900px;
  margin: auto;
}

header {
    text-align: center;
}

header img {
    width: 75%;
    height: auto;
}