main {
  padding: 16px;
  padding-top: 60px;
  max-width: 900px;
  margin: auto;
}

body {
  position: relative;
  margin: 0;
  padding: 0;
}

header {
  background-color: #6495ED;
  padding: 4px 16px;
  position: fixed;
  width: 100%;
}

header ul {
  list-style-type: none;
}