diff --git a/components/NavBar.vue b/components/NavBar.vue
index e77cf845..7ad182a2 100644
--- a/components/NavBar.vue
+++ b/components/NavBar.vue
@@ -1,5 +1,5 @@
 <template>
-  <v-tabs centered background-color='transparent' optional dense icons-and-text class='mt-4'>
+  <v-tabs id='navbar' centered background-color='transparent' optional dense icons-and-text class='mt-4'>
     <v-tab v-if='$auth.loggedIn || settings.allow_anon_event' to='/add' :ripple="false">
       <span class='d-none d-sm-flex'>{{$t('common.add_event')}}</span>
       <v-icon color='primary' v-text='mdiPlus' />
diff --git a/components/admin/Theme.vue b/components/admin/Theme.vue
index fb19f690..e2b01e75 100644
--- a/components/admin/Theme.vue
+++ b/components/admin/Theme.vue
@@ -119,6 +119,16 @@ v-container
             v-btn.float-right(icon color='error' @click.stop='removeFooterLink(link)')
               v-icon(v-text='mdiDeleteForever')
 
+  v-card-title {{$t('admin.custom_js')}}
+  v-card-subtitle(v-html="$t('admin.custom_js_help')")
+  v-card-text
+    v-textarea(:value='custom_js' @change='v => custom_js = v' :label='$t("admin.custom_js")' outlined)
+
+  v-card-title {{$t('admin.custom_css')}}
+  v-card-subtitle(v-html="$t('admin.custom_css_help')")
+  v-card-text
+    v-textarea(:value='custom_css' @change='v => custom_css = v' :label='$t("admin.custom_css")' outlined)
+
 </template>
 <script>
 import { mapActions, mapState } from 'vuex'
@@ -158,7 +168,15 @@ export default {
     hide_calendar: {
       get () { return this.settings.hide_calendar },
       set (value) { this.setSetting({ key: 'hide_calendar', value }) }
-    }
+    },
+    custom_js: {
+      get () { return this.settings.custom_js },
+      set (value) { this.setSetting({ key: 'custom_js', value })}
+    },
+    custom_css: {
+      get () { return this.settings.custom_css },
+      set (value) { this.setSetting({ key: 'custom_css', value })}
+    }    
   },
   methods: {
     ...mapActions(['setSetting', 'setLocalSetting']),
diff --git a/docs/usage/custom_css.md b/docs/usage/custom_css.md
new file mode 100644
index 00000000..b80a1510
--- /dev/null
+++ b/docs/usage/custom_css.md
@@ -0,0 +1,25 @@
+---
+layout: default
+title: Custom CSS
+permalink: /usage/custom_css
+nav_order: 3
+parent: Usage
+---
+
+## Custom CSS <span class='label label-yellow'>Since 1.19.0</span> <span class='label label-red'>BETA</span>
+
+Is it possible to modify the style by integrating some custom css.
+
+Don't imagine you can accomplish miracles because the templates are not designed to be easily modified,
+but don't be afraid to [open an issue](https://framagit.org/les/gancio/-/issues) or even better a PR to add some css selectors or some usage examples to this page.
+
+
+### Remove navbar
+```css
+#navbar {
+    display: none;
+}
+```
+
+> info "References"
+> [#413](https://framagit.org/les/gancio/-/issues/413)
diff --git a/docs/usage/custom_js.md b/docs/usage/custom_js.md
new file mode 100644
index 00000000..fabb356b
--- /dev/null
+++ b/docs/usage/custom_js.md
@@ -0,0 +1,32 @@
+---
+layout: default
+title: Custom Javascript
+permalink: /usage/custom_js
+nav_order: 3
+parent: Usage
+---
+
+## Custom Javascript <span class='label label-yellow'>Since 1.19.0</span> <span class='label label-red'>BETA</span>
+
+You can integrate some javascript code that will be loaded for each user.
+
+Don't imagine you can accomplish miracles because the templates are not designed to be easily modified,
+but don't be afraid to [open an issue](https://framagit.org/les/gancio/-/issues) or even better a PR to add some usage examples to this page.
+
+
+## Examples:
+
+### Integrate Plausible
+```js
+var script = document.createElement('script');
+script.defer = true;
+script.src = "https://plausible.io/js/script.js";
+script.dataset.domain = "yourdomain.com";
+
+document.getElementsByTagName('head')[0].appendChild(script);
+```
+
+
+> info "References"
+> [#413](https://framagit.org/les/gancio/-/issues/413), [#320](https://framagit.org/les/gancio/-/issues/320)
+
diff --git a/layouts/default.vue b/layouts/default.vue
index 00d33b8c..aa405a67 100644
--- a/layouts/default.vue
+++ b/layouts/default.vue
@@ -23,11 +23,20 @@ import { mapState, mapGetters } from 'vuex'
 
 export default {
   head () {
+    const custom_script = [{ type: 'application/javascript', defer: true, src: '/custom_js', body: true }]
+    const custom_style = [{ rel: 'stylesheet', href: this.settings.baseurl + '/custom_css'}]
     return {
       htmlAttrs: {
         lang: this.locale
       },
-      link: [{ rel: 'icon', type: 'image/png', href: this.settings.baseurl + '/logo.png' }],
+      link: [
+        { rel: 'icon', type: 'image/png', href: this.settings.baseurl + '/logo.png' },
+        ...custom_style
+      ],
+      script: [
+        { src: '/gancio-events.es.js', body: true, defer: true },
+        ...custom_script
+      ]
     }
   },
   name: 'Default',
diff --git a/locales/en.json b/locales/en.json
index 3acf8e62..93e5f4cb 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -343,7 +343,11 @@
     "tag_renamed": "Tag \"{oldTag}\" renamed to \"{newTag}\"",
     "stats": "{n_followers} \"actors\" are following this instance, there are {n_events} events from the fediverse and {n_resources} comments",
     "show_download_media": "Show download media action",
-    "show_download_media_hint": "Display a download media button in event's page"
+    "show_download_media_hint": "Display a download media button in event's page",
+    "custom_js": "Custom Javascript Code",
+    "custom_css": "Custom CSS Style",
+    "custom_js_help": "You can integrate some javascript code that will be loaded for each user by writing in this textarea below. You probably want to read the <a href='https://gancio.org/usage/custom_js'>documentation</a> first.",
+    "custom_css_help": "You can customize some stylesheet too, read some example <a href='https://gancio.org/usage/custom_css'>here</a>."
   },
   "auth": {
     "not_confirmed": "Not confirmed yet…",
diff --git a/nuxt.config.js b/nuxt.config.js
index 8296a2ca..a13ac043 100644
--- a/nuxt.config.js
+++ b/nuxt.config.js
@@ -16,7 +16,6 @@ module.exports = {
       { charset: 'utf-8' },
       { name: 'viewport', content: 'width=device-width, initial-scale=1' }
     ],
-    script: [{ src: '/gancio-events.es.js', async: true, body: true }],
   },
   dev: isDev,
   server: config.server,
diff --git a/server/api/controller/settings.js b/server/api/controller/settings.js
index 03adc90d..c45d3aef 100644
--- a/server/api/controller/settings.js
+++ b/server/api/controller/settings.js
@@ -55,7 +55,9 @@ const defaultSettings = {
   plugins: [],
   admin_email: config.admin_email || '',
   smtp: config.smtp || {},
-  collection_in_home: null
+  collection_in_home: null,
+  custom_js: '',
+  custom_css: ''
 }
 
 /**
diff --git a/server/helpers.js b/server/helpers.js
index 4211d275..e2b11a30 100644
--- a/server/helpers.js
+++ b/server/helpers.js
@@ -63,7 +63,6 @@ module.exports = {
 
   async initSettings(_req, res, next) {
     // initialize settings
-    // res.locals.settings = cloneDeep(settingsController.settings)
     const settings = settingsController.settings
     res.locals.settings = {
       title: settings.title || config.title,
@@ -103,7 +102,9 @@ module.exports = {
       footerLinks: settings.footerLinks,
       admin_email: settings.admin_email,
       about: settings.about,
-      collection_in_home: settings.collection_in_home
+      collection_in_home: settings.collection_in_home,
+      custom_js: settings.custom_js,
+      custom_css: settings.custom_css
     }
     next()
   },
@@ -148,6 +149,14 @@ module.exports = {
       return express.static(faviconPath, { immutable: true, maxAge: '10m' })(req, res, next)
     })
 
+    router.use('/custom_js', (_req, res, next) => {
+      return res.type('application/javascript').send(res.locals.settings?.custom_js ?? '')
+    })
+
+    router.use('/custom_css', (_req, res, next) => {
+      return res.type('text/css').send(res.locals.settings?.custom_css ?? '')
+    })
+
     return router
   },
 
diff --git a/store/index.js b/store/index.js
index 11d2dcfc..a29f0c03 100644
--- a/store/index.js
+++ b/store/index.js
@@ -78,8 +78,14 @@ export const mutations = {
 export const actions = {
   // this method is called server side only for each request for nuxt
   // we use it to get configuration from db, set locale, etc...
-  nuxtServerInit ({ commit }, { res, app }) {
+  nuxtServerInit ({ commit }, { res, req, app }) {
     if (res.locals && res.locals.settings) {
+      // TODO: this is temporary, see #431
+      if (!req?.user?.is_admin) {
+        delete res.locals.settings.custom_js
+        delete res.locals.settings.custom_css
+        delete res.locals.settings.admin_email
+      }
       commit('setSettings', res.locals.settings)
       commit('setFilter', {  type: 'show_recurrent',
           value: res.locals.settings.allow_recurrent_event && res.locals.settings.recurrent_event_visible })