Added top margin to model selector

src/style.css

@@ -24,3 +24,6 @@
 .user_message:focus, .response_message:focus, .editing_message_textview:focus, .code_block:focus {
 	box-shadow: 0 0 1px 2px mix(@accent_color, @window_bg_color, 0.5);
 }
+.model_popover {
+  margin-top: 6px;
+}

src/window.ui

@@ -100,6 +100,9 @@
                             </style>
                             <property name="popover">
                               <object class="GtkPopover" id="model_popover">
+                                <style>
+                                  <class name="model_popover"/>
+                                </style>
                                 <property name="has-arrow">false</property>
                                 <child>
                                   <object class="GtkBox">