month-cell: don't enbold overflow label

Only the day label should be made bold.

data/theme/gtk-styles.css

@@ -428,18 +428,11 @@ monthcell {
 	transition: background-color 200ms;
 }
 
-monthcell:selected {
+monthcell:selected { background-color: alpha(@theme_selected_bg_color, 0.1); }
-    font-weight: bold;
+monthcell:selected label.day-label { font-weight: bold; }
-    background-color: alpha(@theme_selected_bg_color, 0.1);
-}
 
-monthcell.today {
+monthcell.today { background-color: alpha(@theme_selected_bg_color, 0.25); }
-    background-color: alpha(@theme_selected_bg_color, 0.25);
+monthcell:selected.today { background-color: alpha(@theme_selected_bg_color, 0.33); }
-}
-
-monthcell:selected.today {
-    background-color: alpha(@theme_selected_bg_color, 0.33);
-}
 
 monthcell.out-of-month {
     background-color: alpha(@theme_bg_color, 0.4);
@@ -455,13 +448,8 @@ monthcell:hover:not(.out-of-month) {
     transition: background-color 200ms;
 }
 
-monthcell:dir(ltr):nth-child(7n + 1) {
+monthcell:dir(ltr):nth-child(7n + 1) { border-left-width: 0; }
-	border-left-width: 0;
+monthcell:dir(rtl):nth-child(7n + 1) { border-right-width: 0; }
-}
-
-monthcell:dir(rtl):nth-child(7n + 1) {
-	border-right-width: 0;
-}
 
 monthcell button {
     padding: 0 4px;

data/ui/month-cell.ui

@@ -49,6 +49,9 @@
                       <object class="GtkLabel" id="day_label">
                         <property name="visible">True</property>
                         <property name="can-focus">False</property>
+                        <style>
+                          <class name="day-label" />
+                        </style>
                       </object>
                       <packing>
                         <property name="pack-type">end</property>