Add a margin to the list

data/style.css

+/*
+ * SPDX-FileCopyrightText: 2024 Bruce Cowan <bruce@bcowan.me.uk>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+listview {
+  margin: 24px 12px;
+}

data/uk.me.bcowan.Rugby.gresource.xml

@@ -9,6 +9,7 @@
     <file compressed="true" preprocess="xml-stripblanks">gtk/help-overlay.ui</file>
     <file compressed="true" preprocess="xml-stripblanks">gtk/prefs.ui</file>
     <file compressed="true" preprocess="xml-stripblanks">gtk/window.ui</file>
+    <file compressed="true">style.css</file>
     <file compressed="true" preprocess="xml-stripblanks">uk.me.bcowan.Rugby.metainfo.xml</file>
   </gresource>
   <gresource prefix="/uk/me/bcowan/Rugby/icons/scalable/actions/">