Remove broken z-indexes

aleksis/core/frontend/components/calendar/CalendarOverview.vue

@@ -83,9 +83,9 @@
           <v-date-picker
             no-title
             v-model="calendarFocus"
-            :style="{ margin: '0px -8px', 'z-index': '10' }"
+            :style="{ margin: '0px -8px' }"
           ></v-date-picker>
-          <v-list flat subheader :style="{ 'z-index': '30' }">
+          <v-list flat subheader>
             <v-subheader>
               {{ $t("calendar.my_calendars") }}
             </v-subheader>
@@ -101,7 +101,7 @@
             </v-btn>
           </v-list>
         </v-col>
-        <v-col lg="9" xl="10" :style="{ 'z-index': '20' }">
+        <v-col lg="9" xl="10">
           <v-sheet height="600">
             <v-expand-transition>
               <v-progress-linear