header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
}
.logo {
  position: fixed;
  top: 2rem;
  left: 2.4rem;
  z-index: 10;
}

.menu_button {
  position: fixed;
  top: 1.6rem;
  right: 2rem;
  display: inline-block;
  z-index: 10;
}