diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9162bb7..7ea57bc 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,30 @@
 2019-11-10  Tom Tromey  <tom@tromey.com>
 
+	* NEWS: Document new settings.
+	* tui/tui-wingeneral.c (box_win): Apply appropriate border style.
+	* tui/tui-win.c (_initialize_tui_win): Add border style
+	observers.
+	* tui/tui-io.h (tui_apply_style): Declare.
+	* tui/tui-io.c (tui_apply_style): Rename from apply_style.  No
+	longer static.
+	(apply_ansi_escape, tui_set_reverse_mode): Update.
+	* cli/cli-style.h (class cli_style_option) <add_setshow_commands>:
+	Add "skip_intensity" parameter.
+	<changed>: New member.
+	<do_set_value>: Declare.
+	(tui_border_style, tui_active_border_style): Declare.
+	* cli/cli-style.c (tui_border_style, tui_active_border_style): New
+	globals.
+	(cli_style_option): Initialize "changed".
+	(cli_style_option::do_set_value): New function.
+	(cli_style_option::add_setshow_commands): Add "skip_intensity"
+	parameter.  Update.
+	(STYLE_ADD_SETSHOW_COMMANDS): Add "SKIP" parameter.
+	(_initialize_cli_style): Update.  Create TUI border style
+	commands.
+
+2019-11-10  Tom Tromey  <tom@tromey.com>
+
 	* tui/tui-winsource.h (tui_copy_source_line): Add "ndigits"
 	parameter.
 	* tui/tui-winsource.c (tui_copy_source_line): Add "ndigits"
diff --git a/gdb/NEWS b/gdb/NEWS
index ec86120..d41a98d 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -146,6 +146,14 @@
 set style highlight intensity VALUE
   Control the styling of highlightings.
 
+set style tui-border foreground COLOR
+set style tui-border background COLOR
+  Control the styling of TUI borders.
+
+set style tui-active-border foreground COLOR
+set style tui-active-border background COLOR
+  Control the styling of the active TUI border.
+
 maint set test-settings KIND
 maint show test-settings KIND
   A set of commands used by the testsuite for exercising the settings
diff --git a/gdb/cli/cli-style.c b/gdb/cli/cli-style.c
index 5535d67..5955d93 100644
--- a/gdb/cli/cli-style.c
+++ b/gdb/cli/cli-style.c
@@ -85,13 +85,23 @@
 
 /* See cli-style.h.  */
 
+cli_style_option tui_border_style ("tui-border", ui_file_style::CYAN);
+
+/* See cli-style.h.  */
+
+cli_style_option tui_active_border_style ("tui-active-border",
+					  ui_file_style::CYAN);
+
+/* See cli-style.h.  */
+
 cli_style_option metadata_style ("metadata", ui_file_style::DIM);
 
 /* See cli-style.h.  */
 
 cli_style_option::cli_style_option (const char *name,
 				    ui_file_style::basic_color fg)
-  : m_name (name),
+  : changed (name),
+    m_name (name),
     m_foreground (cli_colors[fg - ui_file_style::NONE]),
     m_background (cli_colors[0]),
     m_intensity (cli_intensities[ui_file_style::NORMAL])
@@ -102,7 +112,8 @@
 
 cli_style_option::cli_style_option (const char *name,
 				    ui_file_style::intensity i)
-  : m_name (name),
+  : changed (name),
+    m_name (name),
     m_foreground (cli_colors[0]),
     m_background (cli_colors[0]),
     m_intensity (cli_intensities[i])
@@ -143,6 +154,16 @@
   return ui_file_style (fg, bg, intensity);
 }
 
+/* See cli-style.h.  */
+
+void
+cli_style_option::do_set_value (const char *ignore, int from_tty,
+				struct cmd_list_element *cmd)
+{
+  cli_style_option *cso = (cli_style_option *) get_cmd_context (cmd);
+  cso->changed.notify ();
+}
+
 /* Implements the cli_style_option::do_show_* functions.
    WHAT and VALUE are the property and value to show.
    The style for which WHAT is shown is retrieved from CMD context.  */
@@ -198,7 +219,8 @@
 							int from_tty),
 					struct cmd_list_element **show_list,
 					void (*do_show) (const char *args,
-							 int from_tty))
+							 int from_tty),
+					bool skip_intensity)
 {
   m_set_prefix = std::string ("set style ") + m_name + " ";
   m_show_prefix = std::string ("show style ") + m_name + " ";
@@ -213,7 +235,7 @@
 			_("Set the foreground color for this property."),
 			_("Show the foreground color for this property."),
 			nullptr,
-			nullptr,
+			do_set_value,
 			do_show_foreground,
 			&m_set_list, &m_show_list, (void *) this);
   add_setshow_enum_cmd ("background", theclass, cli_colors,
@@ -221,17 +243,18 @@
 			_("Set the background color for this property."),
 			_("Show the background color for this property."),
 			nullptr,
-			nullptr,
+			do_set_value,
 			do_show_background,
 			&m_set_list, &m_show_list, (void *) this);
-  add_setshow_enum_cmd ("intensity", theclass, cli_intensities,
-			&m_intensity,
-			_("Set the display intensity for this property."),
-			_("Show the display intensity for this property."),
-			nullptr,
-			nullptr,
-			do_show_intensity,
-			&m_set_list, &m_show_list, (void *) this);
+  if (!skip_intensity)
+    add_setshow_enum_cmd ("intensity", theclass, cli_intensities,
+			  &m_intensity,
+			  _("Set the display intensity for this property."),
+			  _("Show the display intensity for this property."),
+			  nullptr,
+			  do_set_value,
+			  do_show_intensity,
+			  &m_set_list, &m_show_list, (void *) this);
 }
 
 static cmd_list_element *style_set_list;
@@ -323,7 +346,7 @@
 			   ), set_style_enabled, show_style_sources,
 			   &style_set_list, &style_show_list);
 
-#define STYLE_ADD_SETSHOW_COMMANDS(STYLE, PREFIX_DOC)	  \
+#define STYLE_ADD_SETSHOW_COMMANDS(STYLE, PREFIX_DOC, SKIP)		\
   STYLE.add_setshow_commands (no_class, PREFIX_DOC,		\
 			      &style_set_list,				\
 			      [] (const char *args, int from_tty)	\
@@ -341,46 +364,60 @@
 				  (STYLE.show_list (),			\
 				   from_tty,				\
 				   "");					\
-			      })
+			      }, SKIP)
 
   STYLE_ADD_SETSHOW_COMMANDS (file_name_style,
 			      _("\
 Filename display styling.\n\
-Configure filename colors and display intensity."));
+Configure filename colors and display intensity."), false);
 
   STYLE_ADD_SETSHOW_COMMANDS (function_name_style,
 			      _("\
 Function name display styling.\n\
-Configure function name colors and display intensity"));
+Configure function name colors and display intensity"), false);
 
   STYLE_ADD_SETSHOW_COMMANDS (variable_name_style,
 			      _("\
 Variable name display styling.\n\
-Configure variable name colors and display intensity"));
+Configure variable name colors and display intensity"), false);
 
   STYLE_ADD_SETSHOW_COMMANDS (address_style,
 			      _("\
 Address display styling.\n\
-Configure address colors and display intensity"));
+Configure address colors and display intensity"), false);
 
   STYLE_ADD_SETSHOW_COMMANDS (title_style,
 			      _("\
 Title display styling.\n\
 Configure title colors and display intensity\n\
 Some commands (such as \"apropos -v REGEXP\") use the title style to improve\n\
-readability."));
+readability."), false);
 
   STYLE_ADD_SETSHOW_COMMANDS (highlight_style,
 			      _("\
 Highlight display styling.\n\
 Configure highlight colors and display intensity\n\
 Some commands use the highlight style to draw the attention to a part\n\
-of their output."));
+of their output."), false);
 
   STYLE_ADD_SETSHOW_COMMANDS (metadata_style,
 			      _("\
 Metadata display styling.\n\
 Configure metadata colors and display intensity\n\
 The \"metadata\" style is used when GDB displays information about\n\
-your data, for example \"<unavailable>\""));
+your data, for example \"<unavailable>\""), false);
+
+  STYLE_ADD_SETSHOW_COMMANDS (tui_border_style,
+			      _("\
+TUI border display styling.\n\
+Configure TUI border colors\n\
+The \"tui-border\" style is used when GDB displays the border of a\n\
+TUI window that does not have the focus."), true);
+
+  STYLE_ADD_SETSHOW_COMMANDS (tui_active_border_style,
+			      _("\
+TUI active border display styling.\n\
+Configure TUI active border colors\n\
+The \"tui-active-border\" style is used when GDB displays the border of a\n\
+TUI window that does have the focus."), true);
 }
diff --git a/gdb/cli/cli-style.h b/gdb/cli/cli-style.h
index 6716471..a14e81d 100644
--- a/gdb/cli/cli-style.h
+++ b/gdb/cli/cli-style.h
@@ -22,6 +22,7 @@
 
 #include "ui-file.h"
 #include "command.h"
+#include "gdbsupport/observable.h"
 
 /* A single CLI style option.  */
 class cli_style_option
@@ -50,7 +51,8 @@
 			     struct cmd_list_element **set_list,
 			     void (*do_set) (const char *args, int from_tty),
 			     struct cmd_list_element **show_list,
-			     void (*do_show) (const char *args, int from_tty));
+			     void (*do_show) (const char *args, int from_tty),
+			     bool skip_intensity);
 
   /* Return the 'set style NAME' command list, that can be used
      to build a lambda DO_SET to call add_setshow_commands.  */
@@ -59,6 +61,9 @@
   /* Same as SET_LIST but for the show command list.  */
   struct cmd_list_element *show_list () { return m_show_list; };
 
+  /* This style can be observed for any changes.  */
+  gdb::observers::observable<> changed;
+
 private:
 
   /* The style name.  */
@@ -79,6 +84,10 @@
   struct cmd_list_element *m_set_list = nullptr;
   struct cmd_list_element *m_show_list = nullptr;
 
+  /* Callback to notify the observable.  */
+  static void do_set_value (const char *ignore, int from_tty,
+			    struct cmd_list_element *cmd);
+
   /* Callback to show the foreground.  */
   static void do_show_foreground (struct ui_file *file, int from_tty,
 				  struct cmd_list_element *cmd,
@@ -114,6 +123,12 @@
 /* The metadata style.  */
 extern cli_style_option metadata_style;
 
+/* The border style of a TUI window that does not have the focus.  */
+extern cli_style_option tui_border_style;
+
+/* The border style of a TUI window that does have the focus.  */
+extern cli_style_option tui_active_border_style;
+
 /* True if source styling is enabled.  */
 extern bool source_styling;
 
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index 30407de..d983e76 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,5 +1,10 @@
 2019-11-10  Tom Tromey  <tom@tromey.com>
 
+	* gdb.texinfo (TUI Configuration): Mention TUI border styles.
+	(Output Styling): Document new settings.
+
+2019-11-10  Tom Tromey  <tom@tromey.com>
+
 	* gdb.texinfo (TUI Configuration): Document new setting.
 
 2019-10-31  Andrew Burgess  <andrew.burgess@embecosm.com>
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index c3e0538..c09a523 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -25442,6 +25442,21 @@
 the command @command{apropos -v REGEXP} uses the highlight style to
 mark the documentation parts matching @var{regexp}.
 
+@item tui-border
+Control the styling of the TUI border.  Note that, unlike other
+styling options, only the color of the border can be controlled via
+@code{set style}.  This was done for compatibility reasons, as TUI
+controls to set the border's intensity predated the addition of
+general styling to @value{GDBN}.  @xref{TUI Configuration}.
+
+@item tui-active-border
+Control the styling of the active TUI border; that is, the TUI window
+that has the focus.  Note that, unlike other styling options, only the
+color of the border can be controlled via @code{set style}.  This was
+done for compatibility reasons, as TUI controls to set the active
+border's intensity predated the addition of general styling to
+@value{GDBN}.  @xref{TUI Configuration}.
+
 @end table
 
 @node Numbers
@@ -27951,6 +27966,9 @@
 only a single space to separate the line numbers from the source.
 @end table
 
+Note that the colors of the TUI borders can be controlled using the
+appropriate @code{set style} commands.  @xref{Output Styling}.
+
 @node Emacs
 @chapter Using @value{GDBN} under @sc{gnu} Emacs
 
diff --git a/gdb/tui/tui-io.c b/gdb/tui/tui-io.c
index 964f2e3..2eef288 100644
--- a/gdb/tui/tui-io.c
+++ b/gdb/tui/tui-io.c
@@ -306,8 +306,8 @@
 
 /* Apply STYLE to W.  */
 
-static void
-apply_style (WINDOW *w, ui_file_style style)
+void
+tui_apply_style (WINDOW *w, ui_file_style style)
 {
   /* Reset.  */
   wattron (w, A_NORMAL);
@@ -413,7 +413,7 @@
       style.set_reverse (true);
     }
 
-  apply_style (w, style);
+  tui_apply_style (w, style);
   return n_read;
 }
 
@@ -438,7 +438,7 @@
       style.set_fg (reverse_save_fg);
     }
 
-  apply_style (w, style);
+  tui_apply_style (w, style);
 }
 
 /* Print LENGTH characters from the buffer pointed to by BUF to the
diff --git a/gdb/tui/tui-io.h b/gdb/tui/tui-io.h
index ec23787..01bfe45 100644
--- a/gdb/tui/tui-io.h
+++ b/gdb/tui/tui-io.h
@@ -51,6 +51,9 @@
 /* Enter/leave reverse video mode.  */
 extern void tui_set_reverse_mode (WINDOW *w, bool reverse);
 
+/* Apply STYLE to the window.  */
+extern void tui_apply_style (WINDOW *w, ui_file_style style);
+
 extern struct ui_out *tui_out;
 extern cli_ui_out *tui_old_uiout;
 
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index ddc93e4..684936d 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -30,6 +30,7 @@
 #include "breakpoint.h"
 #include "frame.h"
 #include "cli/cli-cmds.h"
+#include "cli/cli-style.h"
 #include "top.h"
 #include "source.h"
 #include "event-loop.h"
@@ -1467,4 +1468,7 @@
 the line numbers and uses less horizontal space."),
 			   tui_set_compact_source, tui_show_compact_source,
 			   &tui_setlist, &tui_showlist);
+
+  tui_border_style.changed.attach (tui_rehighlight_all);
+  tui_active_border_style.changed.attach (tui_rehighlight_all);
 }
diff --git a/gdb/tui/tui-wingeneral.c b/gdb/tui/tui-wingeneral.c
index b6dd3f9..e139368 100644
--- a/gdb/tui/tui-wingeneral.c
+++ b/gdb/tui/tui-wingeneral.c
@@ -22,9 +22,11 @@
 #include "defs.h"
 #include "tui/tui.h"
 #include "tui/tui-data.h"
+#include "tui/tui-io.h"
 #include "tui/tui-wingeneral.h"
 #include "tui/tui-win.h"
 #include "tui/tui-stack.h"
+#include "cli/cli-style.h"
 
 #include "gdb_curses.h"
 
@@ -51,6 +53,11 @@
   else
     attrs = tui_border_attrs;
 
+  /* tui_apply_style resets the style entirely, so be sure to call it
+     before applying ATTRS.  */
+  tui_apply_style (win, (highlight_flag
+			 ? tui_active_border_style.style ()
+			 : tui_border_style.style ()));
   wattron (win, attrs);
 #ifdef HAVE_WBORDER
   wborder (win, tui_border_vline, tui_border_vline,
@@ -77,6 +84,7 @@
 	}
     }
   wattroff (win, attrs);
+  tui_apply_style (win, ui_file_style ());
 }
 
 
