$scrollbar--thumb--background--inactive: rgba(#1a2f3d, 0.3);
$scrollbar--thumb--background--hover: rgba(#1a2f3d, 0.6);
$scrollbar--thumb--background--inverted--inactive: rgba(#e9eef2, 0.3);
$scrollbar--thumb--background--inverted--hover: rgba(#e9eef2, 0.6);

.scrollbars {

  &__thumb {
    background: $scrollbar--thumb--background--inactive;
    border-radius: 10px;
    cursor: pointer;
    opacity: 0;
    transition: background 0.25s, opacity 0.5s;

    &:active {
      opacity: 1;
    }

    &:hover,
    &:active {
      background: $scrollbar--thumb--background--hover;
    }

    .is-inverted & {
      background: $scrollbar--thumb--background--inverted--inactive;

      &:hover,
      &:active {
        background: $scrollbar--thumb--background--inverted--hover;
      }
    }
  }

  &:hover {

    .scrollbars__thumb {
      opacity: 1;
    }
  }
}