Handle dropdowns near edge of page where items might not be visible

Created by: Mevrael

• When .dropdown-menu have many dropdown-items
• and there are not enough space in viewport
• -> dropdown-menu itself is not scrollable and it is impossible to view dropdown-items out of viewport

Those 2 simple lines of CSS (without any JS) works like a charm

.dropdown-menu {
  overflow-y: auto;
  max-height: 80vh;
}

Even if it's not the best solution and still in some cases (large dropdown at the bottom of page but there should be a JS to show dropdown up not down) will fail, for most cases it will work and I think it's a good temporary option until someone will make an issue with his use case.