message: Create header.component.scss
diff: }
  }
  .dropdown-content {
  - background-color: transparent;
  + background-color: gray;
  li {
  background-color: transparent;
  a {
  }
  }
  .dropdown-content {
  - background-color: transparent;
  + background-color: gray;
  li {
  background-color: transparent;
  a {
  