Uses granite style class large icons

Author: xchan14

data/Application.css

@@ -19,7 +19,7 @@
 }
 
 .form-field {
-  margin-bottom: 16px
+  margin-bottom: 16px;
 }
 
 .entry-button-text {

src/views/MainWindow.vala

@@ -84,7 +84,7 @@ public class Larawan.Views.MainWindow : Adw.ApplicationWindow {
         };
         settings_button.add_css_class ("settings-button");
         settings_button.clicked.connect (on_settings_button_clicked);
-        ((Image) settings_button.child).pixel_size = 32;
+        settings_button.add_css_class (Granite.STYLE_CLASS_LARGE_ICONS);
 
         var overlay = new Overlay () {
             child = window_handle,