header {
  position: fixed;
  top: 0;
  width: 100%;
  height: 150px;
  background: linear-gradient(
    to bottom,
    rgba(10,10,10,1) 0%,
    rgba(10,10,10,0.9) 70%,
    rgba(10,10,10,0) 100%
  );
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 1rem;
  z-index: 1000;
}
header img {
  width: 60%;
  height: auto;
}

@media (max-width: 768px) {
  header {
    height: 120px;
    padding: 0.5rem;
  }
  header img {
    width: 90%;
  }
}