Fix z-index issue with datepickers on Edit event page

Closes #558

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/views/Event/Edit.vue

@@ -33,6 +33,7 @@
 
         <b-field horizontal :label="$t('Starts on…')" class="begins-on-field">
           <b-datetimepicker
+            class="datepicker starts-on"
             :placeholder="$t('Type or select a date…')"
             icon="calendar-today"
             :locale="$i18n.locale"
@@ -45,6 +46,7 @@
 
         <b-field horizontal :label="$t('Ends on…')">
           <b-datetimepicker
+            class="datepicker ends-on"
             :placeholder="$t('Type or select a date…')"
             icon="calendar-today"
             :locale="$i18n.locale"
@@ -381,6 +383,12 @@ h2.subtitle {
   }
 }
 
+.datepicker {
+  ::v-deep .dropdown-menu {
+    z-index: 200;
+  }
+}
+
 section {
   & > .container {
     padding: 2rem 1.5rem;