Colloid-gtk-theme/src/sass/libadwaita/apps/_builder.scss

//
// Builder
//

popover.background.global-search {
  > arrow, > contents { padding: 0; }
}

popover.background.pages-popover {
  listview > row {
    padding: $base_padding;

    button {
      margin: 0;
    }

    check {
      margin: 4px 2px;
      -gtk-icon-size: 12px;
    }
  }
}

panelresizer .top-bar {
  box-shadow: inset 0 -1px $border_color;
}

.frameheader.header {
  min-height: $large_size;
  padding: 0;
  border: none;
  border-bottom: 1px solid $border_color;
  background-color: $headerbar_backdrop_color;

  &:backdrop {
    background-color: $headerbar_bg_color;
  }

  tabbar.inline {
    tabbox > tabboxchild {
      margin: 0;
    }
  }
}

panelframeswitcher {
  &.frameheader.header { padding: 0 $base_padding; }

  > button.toggle.image-button {
    border: none;
    margin: $base_padding 0;
  }
}

panelstatusbar {
  box-shadow: inset 0 1px $border_color;

  > menubutton > button,
  > paneltogglebutton button {
    border-radius: 0;
    @extend %button_basic_flat;
  }
}

panelwidget entry.statusbar {
  background-color: $window_bg_color;
  border-radius: 0;
  outline: none;
  box-shadow: none;
  border-top: 1px solid $border_color;

  &:focus-within {
    outline: none;
  }
}

.IdeTweaksWindow,
.org-gnome-Builder {
  .boxed-list {
    box-shadow: inset 0 0 0 1px gtkalpha(currentColor, 0.08);
  }
}

// Setting window
.style-variant {
  padding: 0 $base_padding * 2;

  button.toggle {
    padding: 0;

    &, &:hover, &:focus, &:active, &:checked {
      background: none;
      outline: none;
      border: none;
      box-shadow: none;
    }

    > stylevariantpreview > .wallpaper {
      border-radius: $button_radius;
      outline-color: transparent;
      outline-width: 3px;
      outline-offset: $base_padding / 2;
      outline-style: solid;
      box-shadow: none;
    }

    &:hover > stylevariantpreview > .wallpaper {
      outline-color: gtkalpha(currentColor, 0.05);
    }

    &:active > stylevariantpreview > .wallpaper {
      outline-color: gtkalpha(currentColor, 0.15);
    }

    &:checked > stylevariantpreview > .wallpaper {
      outline-color: $accent_color;
    }
  }
}