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diff --git a/src/window.vala b/src/window.vala
index a3a6bfc..f98298e 100644
--- a/src/window.vala
+++ b/src/window.vala
@@ -1,66 +1,67 @@
public class WriteAs.MainWindow : Gtk.ApplicationWindow {
private Gtk.TextView canvas;
private bool dark_mode = false;
construct {
construct_toolbar();
canvas = new Gtk.TextView();
+ canvas.margin = 20;
add(canvas);
}
public MainWindow(Gtk.Application app) {
set_application(app);
set_default_size(800, 600);
}
private void construct_toolbar() {
var header = new Gtk.HeaderBar();
header.title = "";
header.show_close_button = true;
set_titlebar(header);
var darkmode_button = new Gtk.ToggleButton();
// NOTE the fallback icon is a bit of a meaning stretch, but it works.
var icon_theme = Gtk.IconTheme.get_default();
darkmode_button.image = new Gtk.Image.from_icon_name(
icon_theme.has_icon("writeas-bright-dark") ?
"writeas-bright-dark" : "weather-clear-night",
Gtk.IconSize.SMALL_TOOLBAR);
darkmode_button.draw_indicator = false;
var settings = Gtk.Settings.get_default();
darkmode_button.toggled.connect(() => {
settings.gtk_application_prefer_dark_theme = darkmode_button.active;
dark_mode = darkmode_button.active;
adjust_text_style();
});
header.pack_end(darkmode_button);
}
private Gtk.CssProvider cur_styles = null;
private void adjust_text_style() {
try {
var styles = canvas.get_style_context();
if (cur_styles != null) styles.remove_provider(cur_styles);
var css = "";
if (dark_mode) {
// Try to detect whether the system provided a better dark mode.
var text_color = styles.get_color(Gtk.StateFlags.ACTIVE);
double h, s, v;
Gtk.rgb_to_hsv(text_color.red, text_color.green, text_color.blue,
out h, out s, out v);
if (v < 0.5) css = "* {background: black; color: white;}";
}
cur_styles = new Gtk.CssProvider();
cur_styles.load_from_data(css);
styles.add_provider(cur_styles, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
} catch (Error e) {
warning(e.message);
}
}
}

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