.site-brand-logo {
  width: 40px;
  height: 40px;
  display: block;
  flex: 0 0 40px;
  object-fit: contain;
}

@media (max-width: 640px) {
  .site-brand-logo {
    width: 34px;
    height: 34px;
    flex-basis: 34px;
  }
}