.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 3rem; 
  background-color: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all 0.3s ease;
}
.topbar__nav a[aria-current="page"] {
  /* cor diferente, sublinhado, etc */
}