paperless-ngx/src-ui/src/theme.scss

:root {
  // base color e.g. #17541f = hsl(128, 57%, 21%)
  --pngx-primary: 128, 57%;
  --pngx-primary-lightness: 21%;

  --bs-primary: hsl(var(--pngx-primary), var(--pngx-primary-lightness));
  --bs-border-color: var(--bs-gray-400);
  --ngx-primary-faded: hsl(var(--pngx-primary), calc(var(--pngx-primary-lightness) + 72%));
  --ngx-primary-lighten-10: hsl(var(--pngx-primary), calc(var(--pngx-primary-lightness) + 10%));
  --ngx-primary-lighten-30: hsl(var(--pngx-primary), calc(var(--pngx-primary-lightness) + 30%));
  --ngx-primary-darken-10: hsl(var(--pngx-primary), calc(var(--pngx-primary-lightness) - 10%));
  --ngx-primary-darken-15: hsl(var(--pngx-primary), calc(var(--pngx-primary-lightness) - 15%));
  --ngx-primary-darken-18: hsl(var(--pngx-primary), calc(var(--pngx-primary-lightness) - 18%));
  --ngx-bg-darker: var(--bs-gray-100);
  --ngx-focus-alpha: 0.3;
}

svg.logo {
  .leaf {
    fill: var(--bs-primary) !important;
  }
  .text {
    fill: var(--bs-body-color) !important;
  }
}

.nav-link, .list-group-item {
  color: var(--bs-body-color);
}

.bg-body {
  background-color: var(--bs-body-bg);
}

.bg-primary {
  background-color: var(--bs-primary) !important;
}

.btn-primary {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);

  &:hover, &:focus {
    background-color: var(--ngx-primary-darken-10);
    border-color: var(--ngx-primary-darken-10);
  }

  &:disabled, &.disabled {
    background-color: var(--ngx-primary-darken-10) !important;
    border-color: var(--ngx-primary-darken-10) !important;
  }
}

.btn-outline-primary {
  border-color: var(--bs-primary) !important;
  color: var(--bs-primary) !important;

  &:hover, &:focus, &.active, &:active {
    background-color: var(--bs-primary) !important;
    color: var(--bs-light) !important;
  }
}

.btn-outline-secondary {
  color: var(--bs-secondary);
}

.nav-item .sidebaricon {
  color: var(--bs-secondary);
}

.btn:focus,
.btn:active:focus,
.dropdown-item:focus,
.btn-check:focus + .btn,
.form-control:focus,
.form-check-input:focus,
.form-check-radio:focus,
.form-select:focus {
  box-shadow: 0 0 0 0.25rem hsla(var(--pngx-primary), var(--pngx-primary-lightness), var(--ngx-focus-alpha));
}

.form-switch .form-check-input:focus {
  background-image: escape-svg(url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'><circle r='3' fill='#bbb'/></svg>"));
}

.nav-link:focus-visible, .nav-item a:focus-visible {
  outline: none;
  background-color: var(--ngx-bg-darker);
}

a.navbar-brand:focus-visible {
  outline: none;
  color: var(--ngx-primary-darken-10);
}

.dropdown.show {
  > .btn-primary {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
  }

  > .btn-outline-primary {
    color: var(--bs-body-color) !important;
  }
}

a, a:hover, .btn-link, .btn-link:hover {
  color: var(--bs-primary);
}

.form-control:not(.btn),
input,
select,
textarea,
.form-select:not(.is-invalid):not(:disabled),
.form-check-input {
  color: var(--bs-body-color);
  background-color: var(--bs-body-bg);
  border-color: var(--bs-border-color);

  &:focus {
    background-color: var(--ngx-bg-darker);
    color: var(--bs-body-color) !important;
  }
}

.form-check-input:checked {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
}

.form-check-input:focus {
  border-color: var(--bs-primary);
}

.page-link {
  color: var(--bs-secondary);
  background-color: var(--bs-body-bg);
  border-color: var(--bs-border-color) !important;

  &:hover, &:focus {
    background-color: var(--bs-primary) !important;
    color: var(--bs-light) !important;
  }
}

.page-item.active .page-link {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary) !important;
  color: var(--bs-light);
}

.page-item.disabled .page-link {
  background-color: var(--ngx-bg-darker);
}

.nav-tabs {
  border-bottom: 1px solid var(--bs-border-color);

  .nav-link {
    color: var(--bs-primary);

    &.active, &:hover {
      border-color: var(--bs-border-color);
      background-color: var(--bs-body-bg);
      color: var(--bs-body-color);
      border-bottom: 1px solid transparent;
    }

    &:focus {
      border-color: var(--bs-border-color);
    }

    &.active:focus, &:active {
      border-bottom: 1px solid transparent;
    }
  }
}

.ng-select-container,
.ng-select.ng-select-opened > .ng-select-container,
.ng-dropdown-panel,
.ng-dropdown-panel .ng-dropdown-panel-items .ng-option {
  background-color: var(--bs-body-bg) !important;
  color: var(--bs-body-color) !important;
  border-color: var(--bs-border-color) !important;

  input:focus {
    background-color: transparent !important;
  }
}

.input-group-text {
  color: var(--bs-body-color);
  background-color: var(--bs-body-bg);
  border-color: var(--bs-border-color);
}

.list-group-item {
  color: var(--bs-body-color);
  background-color: var(--bs-body-bg);
  border-color: var(--bs-border-color);

  &:hover, &:focus {
    background-color: var(--bs-body-bg);
  }
}

.dropdown-menu {
  background-color: var(--bs-body-bg);

  .dropdown-divider {
    border-color: var(--bs-border-color);
  }

  .dropdown-item {
    color: var(--bs-body-color);

    &:hover {
      background-color: var(--ngx-bg-darker);
      color: var(--bs-body-color);
    }

    &.active {
      background-color: var(--bs-primary);
    }
  }
}

table.table {
  color: var(--bs-body-color);

  .des,.asc {
    background-color: var(--bs-body-bg) !important;
  }
}

.close {
  color: var(--bs-body-color);
}

.modal .btn-close {
  color: var(--bs-body-color);
}

.ngx-file-drop__drop-zone--over {
  background-color: var(--ngx-primary-faded) !important;
}

.alert-danger {
  color: var(--bs-body-color);
  background-color: var(--bs-danger);
  border-color: var(--bs-danger);
}

.alert-secondary {
  background-color: var(--ngx-primary-darken-18);
  border-color: var(--ngx-primary-darken-15);
  color: var(--bs-body-color);
}

.ngb-dp-header,
.ngb-dp-weekdays,
.ngb-dp-month {
  background-color: var(--bs-body-bg);
}

.popover {
  .popover-header,
  .popover-body {
    background-color: var(--ngx-bg-alt);
    border-color: var(--bs-border-color);
  }
}

// fix popover carat colors
.bs-popover-start > .popover-arrow::after, .bs-popover-auto[data-popper-placement^="left"] {
  border-left-color: var(--ngx-bg-alt);
}
.bs-popover-end > .popover-arrow::after, .bs-popover-auto[data-popper-placement^="right"] {
  border-right-color: var(--ngx-bg-alt);
}
.bs-popover-top > .popover-arrow::after, .bs-popover-auto[data-popper-placement^="top"] {
  border-top-color: var(--ngx-bg-alt);
}
.bs-popover-bottom > .popover-arrow::after, .bs-popover-auto[data-popper-placement^="bottom"] {
  border-bottom-color: var(--ngx-bg-alt);
}

.bs-popover-bottom .popover-header::before,
.bs-popover-auto[x-placement^=bottom] .popover-header::before {
  border-bottom-color: var(--ngx-bg-alt);
}