header.html

<!-- header.html -->
<a href="#maincontent" class="skip-link">Skip to Content</a>

<style>
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #000;
  color: white;
  padding: 8px;
  z-index: 100;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
}

.skip-link:focus {
  left: 0;
  width: auto;
  height: auto;
  top: 0;
  overflow: visible;
  z-index: 1000;
  padding: 10px;
  background: #000;
  color: #fff;
  text-align: center;
  font-weight: bold;
  border: none;
  margin: 20px;
  transition: all 0.3s ease;
}
</style>