Add the topbar link active hover background colour to the customisable variables listed in the docs.
$topbar-link-hover-lightness: -30%; /* Darken by 30% */
$topbar-link-bg-hover: darken($topbar-bg, 3%);
$topbar-link-bg-active: darken($topbar-bg, 3%);
+$topbar-link-bg-active-hover: darken($topbar-bg, 5%);
$topbar-dropdown-label-color: #555;
$topbar-dropdown-label-text-transform: uppercase;
$topbar-sticky-class: ".sticky";
$topbar-arrows: true; //Set false to remove the triangle icon from the menu item
```
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