add dark mode in base modal (#1171)

* add dark mode in base modal

* add BaseModalFooter

* fix dark mode in roles modal and send modal

resources/scripts/admin/components/currency-exchange-rate/ExchangeRateBulkUpdate.vue

@@ -50,21 +50,11 @@
           </BaseInputGroup>
         </template>
       </ValidateEach>
-      <div
-        slot="footer"
-        class="
-          z-0
-          flex
-          justify-end
-          mt-4
-          pt-4
-          border-t border-gray-200 border-solid border-modal-bg
-        "
-      >
+      <BaseModalFooter>
         <BaseButton :loading="isSaving" variant="primary" type="submit">
           {{ $t('general.save') }}
         </BaseButton>
-      </div>
+      </BaseModalFooter>
     </form>
   </BaseCard>
 </template>