dcat-admin/resources/assets/dcat/sass/components/_header-navbar.scss

.header-navbar.navbar-shadow {
  box-shadow: $shadow;
}
.header-navbar.floating-nav {
  margin: 1.3rem 2.2rem 0;
}
.navbar-container {
  height: 60px;
}
.navbar-light {
  background-color: white;
}

.dark-mode-switcher {
  margin:0 5px 0 0;
  font-size: 1.5rem;
  cursor: pointer
}