MyMongodb/node_modules/bootstrap/scss/_nav.scss

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// Base class
//
// Kickstart any navigation component with a set of style resets. Works with
// `<nav>`s, `<ul>`s or `<ol>`s.

.nav {
  display: flex;
  flex-wrap: wrap;
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
}

.nav-link {
  display: block;
  padding: $nav-link-padding-y $nav-link-padding-x;

  @include hover-focus() {
    text-decoration: none;
  }

  // Disabled state lightens text
  &.disabled {
    color: $nav-link-disabled-color;
    pointer-events: none;
    cursor: default;
  }
}

//
// Tabs
//

.nav-tabs {
  border-bottom: $nav-tabs-border-width solid $nav-tabs-border-color;

  .nav-item {
    margin-bottom: -$nav-tabs-border-width;
  }

  .nav-link {
    border: $nav-tabs-border-width solid transparent;
    @include border-top-radius($nav-tabs-border-radius);

    @include hover-focus() {
      border-color: $nav-tabs-link-hover-border-color;
    }

    &.disabled {
      color: $nav-link-disabled-color;
      background-color: transparent;
      border-color: transparent;
    }
  }

  .nav-link.active,
  .nav-item.show .nav-link {
    color: $nav-tabs-link-active-color;
    background-color: $nav-tabs-link-active-bg;
    border-color: $nav-tabs-link-active-border-color;