diff --git a/mail-vue/src/i18n/en.js b/mail-vue/src/i18n/en.js
index 5f13f76..50c95da 100644
--- a/mail-vue/src/i18n/en.js
+++ b/mail-vue/src/i18n/en.js
@@ -143,6 +143,7 @@ const en = {
     websiteTitle: 'Title',
     loginBoxOpacity: 'Login Box Opacity',
     loginBackground: 'Background',
+    backgroundDarken: 'Background Dim',
     emailSetting: 'Email',
     receiveEmail: 'Receive Email',
     autoRefresh: 'Auto Refresh',
diff --git a/mail-vue/src/i18n/zh.js b/mail-vue/src/i18n/zh.js
index b5d09c3..c518468 100644
--- a/mail-vue/src/i18n/zh.js
+++ b/mail-vue/src/i18n/zh.js
@@ -143,6 +143,7 @@ const zh = {
     websiteTitle: '网站标题',
     loginBoxOpacity: '登录透明',
     loginBackground: '登录背景',
+    backgroundDarken: '背景压暗',
     emailSetting: '邮件设置',
     receiveEmail: '邮件接收',
     autoRefresh: '自动刷新',
diff --git a/mail-vue/src/store/setting.js b/mail-vue/src/store/setting.js
index b24414f..3a90dc2 100644
--- a/mail-vue/src/store/setting.js
+++ b/mail-vue/src/store/setting.js
@@ -6,6 +6,7 @@ export const useSettingStore = defineStore('setting', {
         settings: {
             r2Domain: '',
             loginOpacity: 1.00,
+            loginDarkenFactor: 0,
         },
         lang: '',
     }),
diff --git a/mail-vue/src/views/login/index.vue b/mail-vue/src/views/login/index.vue
index b65be49..f7dada5 100644
--- a/mail-vue/src/views/login/index.vue
+++ b/mail-vue/src/views/login/index.vue
@@ -237,16 +237,27 @@ const loginOpacity = computed(() => {
   return uiStore.dark ? `rgba(0, 0, 0, ${opacity})` : `rgba(255, 255, 255, ${opacity})`
 })
 
+const loginDarkenFactor = computed(() => {
+  const factor = Number(settingStore.settings.loginDarkenFactor ?? 0)
+  if (Number.isNaN(factor)) return 0
+  return Math.min(1, Math.max(0, factor))
+})
+
 const hideLoginDomain = computed(() => settingStore.settings.loginDomain === 1)
 
 const background = computed(() => {
-
-  return settingStore.settings.background ? {
-    'background-image': `url(${cvtR2Url(settingStore.settings.background)})`,
-    'background-repeat': 'no-repeat',
-    'background-size': 'cover',
-    'background-position': 'center'
-  } : ''
+  const bg = settingStore.settings.background
+  if (!bg) return ''
+  const bgUrl = cvtR2Url(bg)
+  return {
+    'background-image': `
+      linear-gradient(rgba(0, 0, 0, ${loginDarkenFactor.value}), rgba(0, 0, 0, ${loginDarkenFactor.value})),
+      url(${bgUrl})
+    `,
+    'background-repeat': 'no-repeat, no-repeat',
+    'background-size': 'cover, cover',
+    'background-position': 'center, center'
+  }
 })
 
 const openSelect = () => {
diff --git a/mail-vue/src/views/sys-setting/index.vue b/mail-vue/src/views/sys-setting/index.vue
index 072c406..02867ed 100644
--- a/mail-vue/src/views/sys-setting/index.vue
+++ b/mail-vue/src/views/sys-setting/index.vue
@@ -120,6 +120,13 @@
                   </div>
                 </div>
               </div>
+              <div class="setting-item">
+                <div class="title-item"><span>{{ $t('backgroundDarken') }}</span></div>
+                <div>
+                  <el-input-number size="small" v-model="loginDarkenFactor" @change="darkenChange" :precision="2"
+                                   :step="0.01" :max="1" :min="0"/>
+                </div>
+              </div>
             </div>
           </div>
 
@@ -855,6 +862,7 @@ const settingLoading = ref(false)
 const clearS3Loading = ref(false)
 const r2DomainInput = ref('')
 const loginOpacity = ref(0)
+const loginDarkenFactor = ref(0)
 const minEmailPrefix = ref(0)
 const emailPrefixFilter = ref([])
 const backgroundUrl = ref('')
@@ -946,6 +954,7 @@ function getSettings() {
     settingStore.domainList = settingData.domainList;
     resendTokenForm.domain = setting.value.domainList[0]
     loginOpacity.value = setting.value.loginOpacity
+    loginDarkenFactor.value = normalizeFactor(setting.value.loginDarkenFactor)
     minEmailPrefix.value = setting.value.minEmailPrefix
     firstLoading.value = false
     backgroundUrl.value = setting.value.background?.startsWith('http') ? setting.value.background : ''
@@ -1231,6 +1240,19 @@ function doOpacityChange() {
   editSetting(form, true)
 }
 
+function normalizeFactor(value) {
+  const factor = Number(value ?? 0)
+  if (Number.isNaN(factor)) return 0
+  return Math.min(1, Math.max(0, factor))
+}
+
+function doDarkenChange() {
+  if (!settingReady.value) return
+  const form = {}
+  form.loginDarkenFactor = normalizeFactor(loginDarkenFactor.value)
+  editSetting(form, true)
+}
+
 function resetEmailPrefix() {
   minEmailPrefix.value = setting.value.minEmailPrefix
   emailPrefixFilter.value = setting.value.emailPrefixFilter
@@ -1262,6 +1284,11 @@ const opacityChange = debounce(doOpacityChange, 1000, {
   trailing: true
 })
 
+const darkenChange = debounce(doDarkenChange, 1000, {
+  leading: false,
+  trailing: true
+})
+
 function saveBlackList() {
 
   let form = {
@@ -1494,6 +1521,7 @@ function editSetting(settingForm, refreshStatus = true) {
     aiCodeFilterShow.value = false
   }).catch((e) => {
     loginOpacity.value = setting.value.loginOpacity
+    loginDarkenFactor.value = normalizeFactor(setting.value.loginDarkenFactor)
     setting.value = {...setting.value, ...JSON.parse(backup)}
   }).finally(() => {
     settingLoading.value = false
diff --git a/mail-worker/src/entity/setting.js b/mail-worker/src/entity/setting.js
index b50519f..9738ef9 100644
--- a/mail-worker/src/entity/setting.js
+++ b/mail-worker/src/entity/setting.js
@@ -24,6 +24,7 @@ export const setting = sqliteTable('setting', {
 	ruleEmail: text('rule_email').default('').notNull(),
 	ruleType: integer('rule_type').default(0).notNull(),
 	loginOpacity: integer('login_opacity').default(0.88),
+	loginDarkenFactor: integer('login_darken_factor').default(0),
 	resendTokens: text('resend_tokens').default("{}").notNull(),
 	noticeTitle: text('notice_title').default('').notNull(),
 	noticeContent: text('notice_content').default('').notNull(),
diff --git a/mail-worker/src/init/init.js b/mail-worker/src/init/init.js
index 249d344..efa7b73 100644
--- a/mail-worker/src/init/init.js
+++ b/mail-worker/src/init/init.js
@@ -29,10 +29,19 @@ const dbInit = {
 		await this.v2_8DB(c);
 		await this.v2_9DB(c);
 		await this.v3_0DB(c);
+		await this.v3_1DB(c);
 		await settingService.refresh(c);
 		return c.text('success');
 	},
 
+	async v3_1DB(c) {
+		try {
+			await c.env.db.prepare(`ALTER TABLE setting ADD COLUMN login_darken_factor INTEGER NOT NULL DEFAULT 0;`).run();
+		} catch (e) {
+			console.warn(`跳过字段：${e.message}`);
+		}
+	},
+
 	async v3_0DB(c) {
 		try {
 			await c.env.db.batch([
diff --git a/mail-worker/src/service/setting-service.js b/mail-worker/src/service/setting-service.js
index 7c63b22..9356b5f 100644
--- a/mail-worker/src/service/setting-service.js
+++ b/mail-worker/src/service/setting-service.js
@@ -138,6 +138,11 @@ const settingService = {
 			params.aiCodeFilter = params.aiCodeFilter + '';
 		}
 
+		if (params.loginDarkenFactor !== undefined) {
+			const factor = Number(params.loginDarkenFactor);
+			params.loginDarkenFactor = Number.isNaN(factor) ? 0 : Math.min(1, Math.max(0, factor));
+		}
+
 		params.resendTokens = JSON.stringify(resendTokens);
 		await orm(c).update(setting).set({ ...params }).returning().get();
 		await this.refresh(c);
@@ -214,6 +219,7 @@ const settingService = {
 			siteKey: settingRow.siteKey,
 			background: settingRow.background,
 			loginOpacity: settingRow.loginOpacity,
+			loginDarkenFactor: settingRow.loginDarkenFactor,
 			domainList: settingRow.loginDomain === 1 && !token ? [] : settingRow.domainList,
 			regKey: settingRow.regKey,
 			regVerifyOpen: settingRow.regVerifyOpen,