/* HEADER */
header {
  display: flex;
  justify-content: center;
  background: #3c6ed5;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
}
header a {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  padding: 2rem;
  color: #fff;
}

main {
  margin-top: 6.5rem;
  padding: 3rem 2rem;
}