fixed horizontal resizing

data/input-remapper.glade

@@ -580,6 +580,7 @@ Shortcut: ctrl + del</property>
                               <object class="GtkBox">
                                 <property name="visible">True</property>
                                 <property name="can-focus">False</property>
+                                <property name="halign">center</property>
                                 <property name="margin-start">18</property>
                                 <property name="margin-end">18</property>
                                 <property name="margin-bottom">18</property>
@@ -587,6 +588,7 @@ Shortcut: ctrl + del</property>
                                 <property name="spacing">6</property>
                                 <child>
                                   <object class="GtkBox">
+                                    <property name="width-request">463</property>
                                     <property name="visible">True</property>
                                     <property name="can-focus">False</property>
                                     <property name="spacing">6</property>