Index: src/table/settings.ini
===================================================================
--- src/table/settings.ini	(revision 27142)
+++ src/table/settings.ini	(working copy)
@@ -3507,12 +3507,12 @@
 
 [SDTC_VAR]
 ifdef    = ENABLE_NETWORK
-var      = gui.network_chat_box_width
+var      = gui.network_chat_box_width_pct
 type     = SLE_UINT16
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
-def      = 620
-min      = 200
-max      = 65535
+def      = 40
+min      = 10
+max      = 100
 cat      = SC_EXPERT
 
 [SDTC_VAR]
Index: src/network/network_chat_gui.cpp
===================================================================
--- src/network/network_chat_gui.cpp	(revision 27142)
+++ src/network/network_chat_gui.cpp	(working copy)
@@ -120,7 +120,7 @@
 
 	_chatmsg_list        = ReallocT(_chatmsg_list, _settings_client.gui.network_chat_box_height);
 	_chatmsg_box.x       = 10;
-	_chatmsg_box.width   = _settings_client.gui.network_chat_box_width;
+	_chatmsg_box.width   = _settings_client.gui.network_chat_box_width_pct * _screen.width / 100;
 	NetworkReInitChatBoxSize();
 	_chatmessage_visible = false;
 
Index: src/settings_type.h
===================================================================
--- src/settings_type.h	(revision 27142)
+++ src/settings_type.h	(working copy)
@@ -144,7 +144,7 @@
 	uint8  station_gui_sort_by;              ///< sort cargo entries in the station gui by station name or amount
 	uint8  station_gui_sort_order;           ///< the sort order of entries in the station gui - ascending or descending
 #ifdef ENABLE_NETWORK
-	uint16 network_chat_box_width;           ///< width of the chat box in pixels
+	uint16 network_chat_box_width_pct;       ///< width of the chat box in pixels
 	uint8  network_chat_box_height;          ///< height of the chat box in lines
 	uint16 network_chat_timeout;             ///< timeout of chat messages in seconds
 #endif