gnome-shell/data/theme/gnome-shell-sass/widgets/_network-dialog.scss

/* Network Dialogs */
.nm-dialog {
  max-height: 34em;
  min-height: 31em;
  min-width: 32em;
}

.nm-dialog-content {
  spacing: 20px;
  padding: 24px;
}

.nm-dialog-airplane-box { spacing: 12px; }

.nm-dialog-airplane-headline {
  font-weight: bold;
  text-align: center;
}

.nm-dialog-airplane-text { color: $fg_color; }

// header
.nm-dialog-header {
  font-weight: bold;
}
.nm-dialog-header-icon {
  icon-size: $base_icon_size * 2;
}
.nm-dialog-header-hbox { spacing: 10px; }

// list of networks
.nm-dialog-scroll-view {
  border: 1px solid $borders_color;
  padding:0;
  background-color: darken($bg_color, 3%);
}

// list item
.nm-dialog-item {
  @include fontsize($base_font_size);
  border-bottom: 1px solid $borders_color;
  padding: $base_padding * 2;
  spacing: 0px;
  &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

// icons in list
.nm-dialog-icon { icon-size: $base_icon_size; }
.nm-dialog-icons { spacing: $base_spacing * 2; }

// no networks
.no-networks-label { color: $insensitive_fg_color; }
.no-networks-box { spacing: $base_padding; }