diff --git a/client/components/settings/settingBody.jade b/client/components/settings/settingBody.jade
index 9101e18f7..1df41a599 100644
--- a/client/components/settings/settingBody.jade
+++ b/client/components/settings/settingBody.jade
@@ -423,6 +423,14 @@ template(name='layoutSettings')
       .title {{_ 'custom-help-link-url'}}
       .form-group
         input.wekan-form-control#custom-help-link-url(type="text", placeholder="" value="{{currentSetting.customHelpLinkUrl}}")
+    li.layout-form
+      .title {{_ 'custom-css-url'}}
+      .form-group
+        input.wekan-form-control#custom-css-url(type="text", placeholder="" value="{{currentSetting.customCssUrl}}")
+    li.layout-form
+      .title {{_ 'custom-css'}}
+      .form-group
+        textarea#custom-css.wekan-form-control(rows='5')= currentSetting.customCss
     li.layout-form
       .title {{_ 'text-below-custom-login-logo'}}
       .form-group
diff --git a/client/components/settings/settingBody.js b/client/components/settings/settingBody.js
index 682479c92..d70b5ea64 100644
--- a/client/components/settings/settingBody.js
+++ b/client/components/settings/settingBody.js
@@ -469,6 +469,8 @@ BlazeComponent.extendComponent({
     const customLoginLogoImageUrl = ($('#custom-login-logo-image-url').val() || '').trim();
     const customLoginLogoLinkUrl = ($('#custom-login-logo-link-url').val() || '').trim();
     const customHelpLinkUrl = ($('#custom-help-link-url').val() || '').trim();
+    const customCssUrl = ($('#custom-css-url').val() || '').trim();
+    const customCss = ($('#custom-css').val() || '').trim();
     const textBelowCustomLoginLogo = ($('#text-below-custom-login-logo').val() || '').trim();
     const automaticLinkedUrlSchemes = ($('#automatic-linked-url-schemes').val() || '').trim();
     const customTopLeftCornerLogoImageUrl = ($('#custom-top-left-corner-logo-image-url').val() || '').trim();
@@ -496,6 +498,8 @@ BlazeComponent.extendComponent({
           customLoginLogoImageUrl,
           customLoginLogoLinkUrl,
           customHelpLinkUrl,
+          customCssUrl,
+          customCss,
           textBelowCustomLoginLogo,
           customTopLeftCornerLogoImageUrl,
           customTopLeftCornerLogoLinkUrl,
@@ -801,4 +805,3 @@ Template.selectSpinnerName.helpers({
     return Template.instance().data.spinnerName === match;
   },
 });
-
diff --git a/client/lib/customCss.js b/client/lib/customCss.js
new file mode 100644
index 000000000..4312fe532
--- /dev/null
+++ b/client/lib/customCss.js
@@ -0,0 +1,45 @@
+import { Meteor } from 'meteor/meteor';
+import { Tracker } from 'meteor/tracker';
+import { ReactiveCache } from '/imports/reactiveCache';
+
+// Keep external or inline custom CSS from admin settings applied to the document head
+Meteor.startup(() => {
+  const head = document.head || document.getElementsByTagName('head')[0];
+  let customCssLink = null;
+  let customInlineStyle = null;
+
+  Meteor.subscribe('setting');
+
+  Tracker.autorun(() => {
+    const setting = ReactiveCache.getCurrentSetting();
+    if (!setting) return;
+
+    const cssUrl = (setting.customCssUrl || '').trim();
+    const inlineCss = (setting.customCss || '').trim();
+
+    if (cssUrl) {
+      if (!customCssLink) {
+        customCssLink = document.createElement('link');
+        customCssLink.rel = 'stylesheet';
+        customCssLink.id = 'wekan-custom-css-url';
+        head.appendChild(customCssLink);
+      }
+      customCssLink.href = cssUrl;
+    } else if (customCssLink) {
+      customCssLink.remove();
+      customCssLink = null;
+    }
+
+    if (inlineCss) {
+      if (!customInlineStyle) {
+        customInlineStyle = document.createElement('style');
+        customInlineStyle.id = 'wekan-custom-inline-css';
+        head.appendChild(customInlineStyle);
+      }
+      customInlineStyle.textContent = inlineCss;
+    } else if (customInlineStyle) {
+      customInlineStyle.remove();
+      customInlineStyle = null;
+    }
+  });
+});
diff --git a/imports/i18n/data/de.i18n.json b/imports/i18n/data/de.i18n.json
index cfb4ea635..36c380e0a 100644
--- a/imports/i18n/data/de.i18n.json
+++ b/imports/i18n/data/de.i18n.json
@@ -660,6 +660,8 @@
   "custom-login-logo-image-url": "Benutzerdefiniertes Login Logo Bild URL",
   "custom-login-logo-link-url": "Benutzerdefiniertes Login Logo Link URL",
   "custom-help-link-url": "Benutzerdefinierter URL-Link zur Hilfe",
+  "custom-css-url": "Externe CSS-URL",
+  "custom-css": "Benutzerdefiniertes CSS",
   "text-below-custom-login-logo": "Text unterhalb benutzerdefiniertem Login Logo",
   "automatic-linked-url-schemes": "Spezielle URL-Schemas, die durch Klick automatisch öffenbar sein sollen. Ein URL-Schema pro Zeile",
   "username": "Benutzername",
diff --git a/imports/i18n/data/en.i18n.json b/imports/i18n/data/en.i18n.json
index acf3c6934..45b19b706 100644
--- a/imports/i18n/data/en.i18n.json
+++ b/imports/i18n/data/en.i18n.json
@@ -660,6 +660,8 @@
   "custom-login-logo-image-url": "Custom Login Logo Image URL",
   "custom-login-logo-link-url": "Custom Login Logo Link URL",
   "custom-help-link-url": "Custom Help Link URL",
+  "custom-css-url": "Custom external CSS URL",
+  "custom-css": "Custom CSS overrides",
   "text-below-custom-login-logo": "Text below Custom Login Logo",
   "automatic-linked-url-schemes": "Custom URL Schemes which should automatically be clickable. One URL Scheme per line",
   "username": "Username",
diff --git a/models/settings.js b/models/settings.js
index 00349c762..9cf5249a5 100644
--- a/models/settings.js
+++ b/models/settings.js
@@ -85,6 +85,14 @@ Settings.attachSchema(
       type: String,
       optional: true,
     },
+    customCssUrl: {
+      type: String,
+      optional: true,
+    },
+    customCss: {
+      type: String,
+      optional: true,
+    },
     textBelowCustomLoginLogo: {
       type: String,
       optional: true,
@@ -202,6 +210,8 @@ if (Meteor.isServer) {
         modifiedAt: now,
         displayAuthenticationMethod: true,
         defaultAuthenticationMethod: 'password',
+        customCssUrl: '',
+        customCss: '',
       };
       Settings.insert(defaultSetting);
     }
diff --git a/server/publications/settings.js b/server/publications/settings.js
index e2365d523..b9c3499cb 100644
--- a/server/publications/settings.js
+++ b/server/publications/settings.js
@@ -30,6 +30,8 @@ Meteor.publish('setting', () => {
         customTopLeftCornerLogoImageUrl: 1,
         customTopLeftCornerLogoLinkUrl: 1,
         customTopLeftCornerLogoHeight: 1,
+        customCssUrl: 1,
+        customCss: 1,
         customHTMLafterBodyStart: 1,
         customHTMLbeforeBodyEnd: 1,
         displayAuthenticationMethod: 1,