reduce default window size & spacing btw elements

src/window.rs

@@ -144,8 +144,8 @@ impl Window {
         entries_container.show();
         self.headerbar.set_custom_title(Some(&entries_container));
 
-        container.pack_start(&self.preview.borrow().widget, true, true, 24);
-        container.pack_start(&self.levelbar.borrow().widget, true, true, 24);
+        container.pack_start(&self.preview.borrow().widget, true, true, 12);
+        container.pack_start(&self.levelbar.borrow().widget, true, true, 12);
 
         self.widget.add(&container);
         // Restore state

src/window_state.rs

@@ -46,7 +46,7 @@ impl WindowState {
     }
 
     pub fn load_into(&self, window: &gtk::ApplicationWindow, bg_entry: &ColourEntry, fg_entry: &ColourEntry) {
-        window.resize(600, 350);
+        window.resize(550, 300);
 
         if self.x > -1 && self.y > -1 {
             window.move_(self.x, self.y);