WhiteSur-gtk-theme/src/sass/gnome-shell/common/_looking-glass.scss

/* Looking Glass */

// Dialog
#LookingGlassDialog {
  background-color: $base_color;
  spacing: 4px;
  padding: 0;
  border: none;
  border-radius: $bt_radius;
  box-shadow: 0 3px 8px 0 rgba(black, 0.25);
  color: $fg_color;

  & > #Toolbar {
    padding: 0 8px;
    border: none;
    border-radius: 0;
    background-color: rgba($base_color, 0.01);
    box-shadow: inset 0 -1px 0 $borders_color;
  }

  .labels { spacing: 0; }
  .notebook-tab {
    -natural-hpadding: 12px;
    -minimum-hpadding: 6px;
    font-weight: bold;
    color: $hint_fg_color;
    padding-left: 16px;
    padding-right: 16px;
    min-height: $medium_size;
    padding: 0 32px;
    transition-duration: 100ms;

    &:hover {
      box-shadow: inset 0 -2px 0px $track_color;
      color: $fg_color;
      text-shadow: none;
    }
    &:selected {
      border-bottom-width: 0;
      border-color: transparent;
      background-color: rgba($base_color, 0.01);
      box-shadow: inset 0 -2px 0px $light_alt_fg_color;
      color: $fg_color;
      text-shadow: none;
    }
  }
  StBoxLayout#EvalBox { padding: 4px; spacing: 4px; }
  StBoxLayout#ResultsArea { spacing: 4px; }
}

.lg-dialog {
  StEntry {
    min-height: 22px;
    selection-background-color: $primary_color;
    selected-color: $light_alt_fg_color;
  }
  .shell-link {
    color: $link_color;
    &:hover { color: lighten($link_color, 10%); }
    &:active { color: darken($link_color, 10%); }
   }
  .actor-link {
    color: $alt_fg_color;
    &:hover { color: lighten($alt_fg_color, 20%); }
    &:active { color: darken($alt_fg_color, 20%); }
   }
}

.lg-completions-text {
    font-size: .9em;
    font-style: italic;
}

.lg-obj-inspector-title {
    spacing: $base_spacing;
}

.lg-obj-inspector-button {
  padding: 0 16px;
  border: none;
  border-radius: $bt_radius;
  @include font(button);

  &:hover { border: none; }
}

// Extensions
#lookingGlassExtensions { padding: 4px; }

.lg-extensions-list {
    padding: 4px;
    spacing: 6px;
}

.lg-extension {
  border: none;
  border-radius: $bt_radius;
  padding: 4px;
}

.lg-extension-name {
    font-weight: bold;
}

.lg-extension-meta {
    spacing: 6px;
}

// Inspector
#LookingGlassPropertyInspector {
  background: $base_color;
  border: none;
  border-radius: $bt_radius;
  padding: 6px;
  box-shadow: 0 3px 8px 0 rgba(black, 0.25);
}