diff --git a/data/com.github.bleakgrey.tootle.gschema.xml b/data/com.github.bleakgrey.tootle.gschema.xml
index 92aa4c2..51228ec 100644
--- a/data/com.github.bleakgrey.tootle.gschema.xml
+++ b/data/com.github.bleakgrey.tootle.gschema.xml
@@ -29,7 +29,7 @@
 			<default>20</default>
 		</key>
 		<key name="post-text-size" type="i">
-			<default>0</default>
+			<default>100</default>
 		</key>
 		<key name="live-updates" type="b">
 			<default>true</default>
diff --git a/data/ui/dialogs/preferences.ui b/data/ui/dialogs/preferences.ui
index 95e873d..c5f8c84 100644
--- a/data/ui/dialogs/preferences.ui
+++ b/data/ui/dialogs/preferences.ui
@@ -4,7 +4,7 @@
 	<requires lib="gtk+" version="3.22"/>
 	<requires lib="libhandy" version="0.0"/>
 	<template class="TootleDialogsPreferences" parent="HdyPreferencesWindow">
-		<property name="default_height">600</property>
+		<property name="default_height">400</property>
 		<property name="default_width">500</property>
 		<property name="width_request">300</property>
 		<!--<property name="search_enabled">false</property>-->
@@ -111,7 +111,7 @@
 								<object class="HdyActionRow">
 									<property name="visible">True</property>
 									<property name="activatable_widget">post_text_size</property>
-									<property name="title" translatable="yes">Post text size</property>
+									<property name="title" translatable="yes">Post text size (%)</property>
 									<child type="action">
 										<object class="GtkSpinButton" id="post_text_size">
 											<property name="visible">True</property>
@@ -174,10 +174,10 @@
 		<property name="step-increment">1</property>
 	</object>
 	<object class="GtkAdjustment" id="font_adjustment">
-		<property name="lower">0</property>
-		<property name="upper">50</property>
-		<property name="page-increment">1</property>
-		<property name="step-increment">1</property>
+		<property name="lower">100</property>
+		<property name="upper">500</property>
+		<property name="page-increment">10</property>
+		<property name="step-increment">10</property>
 	</object>
 
 </interface>
diff --git a/meson.build b/meson.build
index e964aa8..355b6f7 100644
--- a/meson.build
+++ b/meson.build
@@ -45,7 +45,6 @@ executable(
     'src/API/Attachment.vala',
     'src/Widgets/Avatar.vala',
     'src/Widgets/AccountsButton.vala',
-    'src/Widgets/AlignedLabel.vala',
     'src/Widgets/RichLabel.vala',
     'src/Widgets/Status.vala',
     'src/Widgets/Notification.vala',
diff --git a/src/Dialogs/MainWindow.vala b/src/Dialogs/MainWindow.vala
index 4b46702..eb2232b 100644
--- a/src/Dialogs/MainWindow.vala
+++ b/src/Dialogs/MainWindow.vala
@@ -4,6 +4,8 @@ using Gdk;
 [GtkTemplate (ui = "/com/github/bleakgrey/tootle/ui/dialogs/main.ui")]
 public class Tootle.Dialogs.MainWindow: Gtk.Window, ISavedWindow {
 
+    public const string ZOOM_CLASS = "app-scalable";
+
     [GtkChild]
     protected Stack view_stack;
     [GtkChild]
@@ -22,11 +24,9 @@ public class Tootle.Dialogs.MainWindow: Gtk.Window, ISavedWindow {
 
     Views.Base? last_view = null;
 
-    construct {
-        var provider = new Gtk.CssProvider ();
-        provider.load_from_resource (@"$(Build.RESOURCES)app.css");
-        StyleContext.add_provider_for_screen (Screen.get_default (), provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
+    CssProvider zoom_css_provider = new CssProvider ();
 
+    construct {
         back_button.clicked.connect (() => back ());
         Desktop.set_hotkey_tooltip (back_button, _("Back"), app.ACCEL_BACK);
 
@@ -43,6 +43,13 @@ public class Tootle.Dialogs.MainWindow: Gtk.Window, ISavedWindow {
         add_timeline_view (new Views.Federated (), app.ACCEL_TIMELINE_3, 3);
 
         settings.bind_property ("dark-theme", Gtk.Settings.get_default (), "gtk-application-prefer-dark-theme", BindingFlags.SYNC_CREATE);
+        settings.notify["post-text-size"].connect (() => on_zoom_level_changed ());
+
+        var provider = new Gtk.CssProvider ();
+        provider.load_from_resource (@"$(Build.RESOURCES)app.css");
+        StyleContext.add_provider_for_screen (Screen.get_default (), provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
+        StyleContext.add_provider_for_screen (Screen.get_default (), zoom_css_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
+        on_zoom_level_changed ();
 
         button_press_event.connect (on_button_press);
         update_header ();
@@ -143,4 +150,19 @@ public class Tootle.Dialogs.MainWindow: Gtk.Window, ISavedWindow {
         }
     }
 
+    void on_zoom_level_changed () {
+        var css ="""
+            .%s {
+                font-size: %i%;
+            }
+        """.printf (ZOOM_CLASS, settings.post_text_size);
+
+        try {
+            zoom_css_provider.load_from_data (css);
+        }
+        catch (Error e) {
+            warning (@"Can't set zoom level: $(e.message)");
+        }
+    }
+
 }
diff --git a/src/Widgets/AlignedLabel.vala b/src/Widgets/AlignedLabel.vala
deleted file mode 100644
index 993be7a..0000000
--- a/src/Widgets/AlignedLabel.vala
+++ /dev/null
@@ -1,11 +0,0 @@
-using Gtk;
-
-public class Tootle.Widgets.AlignedLabel : Label {
-
-    public AlignedLabel (string text) {
-        label = text;
-        halign = Align.END;
-        //margin_start = 12;
-    }
-
-}
diff --git a/src/Widgets/RichLabel.vala b/src/Widgets/RichLabel.vala
index f4c6d39..894a4de 100644
--- a/src/Widgets/RichLabel.vala
+++ b/src/Widgets/RichLabel.vala
@@ -13,6 +13,7 @@ public class Tootle.Widgets.RichLabel : Label {
         single_line_mode = false;
         set_line_wrap (true);
 		activate_link.connect (open_link);
+		get_style_context ().add_class (Dialogs.MainWindow.ZOOM_CLASS);
 	}
 
     public RichLabel (string text) {