--- a/cagou/core/simple_xhtml.py	Thu May 10 08:32:46 2018 +0200
+++ b/cagou/core/simple_xhtml.py	Fri May 11 20:07:17 2018 +0200
@@ -23,6 +23,7 @@
 from kivy.uix.stacklayout import StackLayout
 from kivy.uix.label import Label
 from kivy.utils import escape_markup
+from kivy.metrics import sp
 from kivy import properties
 from xml.etree import ElementTree as ET
 from sat_frontends.tools import css_color, strings as sat_strings
@@ -39,6 +40,9 @@
 
 class SimpleXHTMLWidgetEscapedText(Label):
 
+    def on_parent(self, instance, parent):
+        self.font_size = parent.font_size
+
     def _addUrlMarkup(self, text):
         text_elts = []
         idx = 0
@@ -79,7 +83,9 @@
 
 
 class SimpleXHTMLWidgetText(Label):
-    pass
+
+    def on_parent(self, instance, parent):
+        self.font_size = parent.font_size
 
 
 class SimpleXHTMLWidgetImage(AsyncImage):
@@ -139,6 +145,7 @@
     # XXX: bold is only used for escaped text
     bold = properties.BooleanProperty(False)
     content_width = properties.NumericProperty(0)
+    font_size = properties.NumericProperty(sp(14))
 
     # text/XHTML input
 

--- a/cagou/plugins/plugin_wid_chat.kv	Thu May 10 08:32:46 2018 +0200
+++ b/cagou/plugins/plugin_wid_chat.kv	Fri May 11 20:07:17 2018 +0200
@@ -72,6 +72,7 @@
             Label:
                 id: time_label
                 color: (0, 0, 0, 1) if root.mess_data.own_mess else (0.55,0.55,0.55,1)
+                font_size: root.font_size
                 text_size: None, None
                 size_hint: None, None
                 size: self.texture_size
@@ -81,6 +82,8 @@
                 text: u"[b]{}[/b], {}".format(escape(root.mess_data.nick), root.mess_data.time_text)
             Label:
                 id: delivery
+                color: 0.4, 0.4, 0.4, 1
+                font_size: root.font_size
                 text_size: None, None
                 size_hint: None, None
                 size: self.texture_size
@@ -90,7 +93,6 @@
                 # which will allow us to use fonts with more unicode characters
                 font_name: "DejaVuSans"
                 text: u''
-                color: 0.4, 0.4, 0.4, 1
         SimpleXHTMLWidget:
             id: mess_xhtml
             size_hint: 1, None

--- a/cagou/plugins/plugin_wid_chat.py	Thu May 10 08:32:46 2018 +0200
+++ b/cagou/plugins/plugin_wid_chat.py	Fri May 11 20:07:17 2018 +0200
@@ -25,7 +25,7 @@
 from kivy.uix.boxlayout import BoxLayout
 from kivy.uix.gridlayout import GridLayout
 from kivy.uix.textinput import TextInput
-from kivy.metrics import dp
+from kivy.metrics import sp, dp
 from kivy import properties
 from sat_frontends.quick_frontend import quick_widgets
 from sat_frontends.quick_frontend import quick_chat
@@ -65,6 +65,7 @@
     mess_padding = (dp(5), dp(5))
     avatar = properties.ObjectProperty()
     delivery = properties.ObjectProperty()
+    font_size = properties.NumericProperty(sp(12))
 
     def __init__(self, **kwargs):
         # self must be registered in widgets before kv is parsed