.brand img {
  width: clamp(34px, 2.6vw, 40px);
  height: clamp(34px, 2.6vw, 40px);
  flex: 0 0 auto;
  border-radius: 50%;
  object-fit: contain;
  background: transparent;
  border-color: transparent;
}

@media (max-width: 600px) {
  .nav .brand img {
    width: 34px;
    height: 34px;
  }
}