.header-lang {
  position: absolute;
  top: 2rem;
  right: 2.5rem;
  z-index: 10;
  cursor: pointer;
  transition: filter 0.2s;
}
.header-lang img {
  width: 40px;
  height: 28px;
  border-radius: 3px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  border: 1px solid #ddd;
  background: #fff;
}

@media (max-width: 900px) {
  .header-lang {
    top: 1rem;
    right: 1rem;
  }
}