.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  width: 100%;
  min-height: 78px;
}

main {
  padding-top: 78px;
}

@media (max-width: 760px) {
  .site-header {
    min-height: 70px;
  }

  main {
    padding-top: 70px;
  }
}