body {
  margin: 0;
  padding: 0;
}

main img {
  display: block;
  height: auto;
  margin-bottom: 2.5em;
  width: 100%;
}

main {
  box-sizing: border-box;
  margin: 0 auto;
  max-width: 900px;
  padding: 48px;
  width: 100%;
}

nav {
  background-color: #dffa8b;
  display: flex;
    justify-content: center;
  padding: 16px;
  position: sticky;
    top: 0;
}

.logo {
  width: 80px;
}