Navbar dropdown menu color
Bootstrap – How to change Navbar dropdown menu color
main.scss
// Dropdown menu container and contents.
$dropdown-bg: $color-1;
$dropdown-link-color: $color-5;
$dropdown-link-hover-color: darken($color-5, 20%);
$dropdown-link-hover-bg: darken($color-1, 10%);
$dropdown-divider-bg: lighten($color-1, 10%);
$dropdown-border-color: rgba($color-5, .15) !default;