diff --git a/src/components/catalog/catalog.riot b/src/components/catalog/catalog.riot
index 5257a1f..f039bf9 100644
--- a/src/components/catalog/catalog.riot
+++ b/src/components/catalog/catalog.riot
@@ -51,9 +51,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
       onMounted(props) {
         this.display(props, this.state)
       },
-      onUpdated(props, state) {
-
-      },
 
       display(props, state) {
         this.state.repositories = [];
@@ -82,13 +79,13 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
               return acc;
             }, []);
           } else if (this.status == 404) {
-            // registryUI.snackbar('Server not found', true);
+            self.props.onNotify('Server not found', true);
           } else {
-            // registryUI.snackbar(this.responseText);
+            self.props.onNotify(this.responseText);
           }
         });
         oReq.addEventListener('error', function () {
-          // registryUI.snackbar(this.getErrorMessage(), true);
+          self.props.onNotify(this.getErrorMessage(), true);
           state.repositories = [];
         });
         oReq.addEventListener('loadend', function () {
diff --git a/src/components/docker-registry-ui.riot b/src/components/docker-registry-ui.riot
index 32726c0..9110c4b 100644
--- a/src/components/docker-registry-ui.riot
+++ b/src/components/docker-registry-ui.riot
@@ -24,19 +24,20 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
     <router base="#!">
       <route path="{baseRoute}">
         <catalog registry-url="{ state.registryUrl }" registry-name="{ state.name }"
-          catalog-elements-limit="{ state.catalogElementsLimit }" />
+          catalog-elements-limit="{ state.catalogElementsLimit }" on-notify="{ notifySnackbar }" />
       </route>
       <route path="{baseRoute}taglist/(.*)">
         <tag-list registry-url="{ state.registryUrl }" registry-name="{ state.name }" pull-url="{ state.pullUrl }"
           image="{ router.getTagListImage() }" show-content-digest="{props.showContentDigest}"
-          is-image-remove-activated="{props.isImageRemoveActivated}"></tag-list>
+          is-image-remove-activated="{props.isImageRemoveActivated}" on-notify="{ notifySnackbar }"></tag-list>
       </route>
       <route path="{baseRoute}taghistory/(.*)">
         <tag-history registry-url="{ state.registryUrl }" registry-name="{ state.name }" pull-url="{ state.pullUrl }"
           image="{ router.getTagHistoryImage() }" tag="{ router.getTagHistoryTag() }"
-          is-image-remove-activated="{props.isImageRemoveActivated}"></tag-history>
+          is-image-remove-activated="{props.isImageRemoveActivated}" on-notify="{ notifySnackbar }"></tag-history>
       </route>
     </router>
+    <material-snackbar message="{ state.snackbarMessage }" is-error="{ state.snackbarIsError }"></material-snackbar>
   </main>
   <footer>
     <material-footer>
@@ -88,6 +89,19 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
           window.location.host;
         return stripHttps(url);
       },
+      notifySnackbar(message, isError) {
+        if (typeof message === 'string') {
+          this.update({
+            snackbarMessage: message,
+            snackbarIsError: isError || false
+          });
+        } else if (message && message.message) {
+          this.update({
+            snackbarMessage: message.message,
+            snackbarIsError: message.isError
+          });
+        }
+      },
       baseRoute: '/(\\?[^#]*)?(#!)?(/?)',
       router,
       version
diff --git a/src/components/tag-history/tag-history.riot b/src/components/tag-history/tag-history.riot
index 0cba130..fc2a850 100644
--- a/src/components/tag-history/tag-history.riot
+++ b/src/components/tag-history/tag-history.riot
@@ -29,7 +29,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
     <material-spinner />
   </div>
 
-  <material-tabs if="{ state.archs && state.loadend }" useLine="{ true }" tabs="{ state.archs }" onTabChanged="{ onTabChanged }" />
+  <material-tabs if="{ state.archs && state.loadend }" useLine="{ true }" tabs="{ state.archs }"
+    onTabChanged="{ onTabChanged }" />
 
   <material-card each="{ element in state.elements }" class="tag-history-element">
     <tag-history-element each="{ entry in element }" if="{ entry.value && entry.value.length > 0}" entry="{ entry }" />
@@ -49,7 +50,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
       },
       onBeforeMount(props, state) {
         state.elements = [];
-        state.image = new DockerImage(props.image, props.tag, true, props.registryUrl);
+        state.image = new DockerImage(props.image, props.tag, true, props.registryUrl, props.onNotify);
         state.image.fillInfo()
         state.image.on('blobs', this.processBlobs);
         state.image.on('list', this.multiArchList)
@@ -58,7 +59,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
         const state = this.state;
         state.elements = []
         state.image.variants[idx] = state.image.variants[idx] ||
-          new DockerImage(this.props.image, arch.digest, false, this.props.registryUrl);
+          new DockerImage(this.props.image, arch.digest, false, this.props.registryUrl, this.props.onNotify);
         if (state.image.variants[idx].blobs) {
           return this.processBlobs(state.image.variants[idx].blobs);
         }
diff --git a/src/components/tag-list/copy-to-clipboard.riot b/src/components/tag-list/copy-to-clipboard.riot
index 0dfb61c..13e0350 100644
--- a/src/components/tag-list/copy-to-clipboard.riot
+++ b/src/components/tag-list/copy-to-clipboard.riot
@@ -23,6 +23,9 @@
     </material-button>
   </div>
   <script>
+    import {
+      ERROR_CAN_NOT_READ_CONTENT_DIGEST
+    } from '../../scripts/utils';
     export default {
       onBeforeMount(props, state) {
         const prefix = 'docker pull ' + props.pullUrl + '/' + props.image.name;
@@ -39,7 +42,7 @@
       },
       copy() {
         if (!this.state.dockerCmd) {
-          // registryUI.showErrorCanNotReadContentDigest();
+          this.props.onNotify(ERROR_CAN_NOT_READ_CONTENT_DIGEST);
           return;
         }
         const copyText = this.$('input');
@@ -48,7 +51,7 @@
         document.execCommand('copy');
         copyText.style.display = 'none';
 
-        // registryUI.snackbar('`' + this.state.dockerCmd + '` has been copied to clipboard.')
+        this.props.onNotify('`' + this.state.dockerCmd + '` has been copied to clipboard.')
       }
     }
   </script>
diff --git a/src/components/tag-list/image-date.riot b/src/components/tag-list/image-date.riot
index 2e3894c..9827ecd 100644
--- a/src/components/tag-list/image-date.riot
+++ b/src/components/tag-list/image-date.riot
@@ -1,5 +1,5 @@
 <!--
- Copyright (C) 2016-2019 Jones Magloire @Joxit
+ Copyright (C) 2016-2021 Jones Magloire @Joxit
 
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
diff --git a/src/components/tag-list/image-size.riot b/src/components/tag-list/image-size.riot
index 17f3588..619af6e 100644
--- a/src/components/tag-list/image-size.riot
+++ b/src/components/tag-list/image-size.riot
@@ -1,5 +1,5 @@
 <!--
- Copyright (C) 2016-2019 Jones Magloire @Joxit
+ Copyright (C) 2016-2021 Jones Magloire @Joxit
 
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
diff --git a/src/components/tag-list/image-tag.riot b/src/components/tag-list/image-tag.riot
index 6b1a506..ad5dc62 100644
--- a/src/components/tag-list/image-tag.riot
+++ b/src/components/tag-list/image-tag.riot
@@ -1,5 +1,5 @@
 <!--
- Copyright (C) 2016-2019 Jones Magloire @Joxit
+ Copyright (C) 2016-2021 Jones Magloire @Joxit
 
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
diff --git a/src/components/tag-list/pagination.riot b/src/components/tag-list/pagination.riot
index 43a764f..99ce37a 100644
--- a/src/components/tag-list/pagination.riot
+++ b/src/components/tag-list/pagination.riot
@@ -1,5 +1,5 @@
 <!--
-Copyright (C) 2016-2019 Jones Magloire @Joxit
+Copyright (C) 2016-2021 Jones Magloire @Joxit
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as published by
diff --git a/src/components/tag-list/remove-image.riot b/src/components/tag-list/remove-image.riot
index 6369d0f..2f78da5 100644
--- a/src/components/tag-list/remove-image.riot
+++ b/src/components/tag-list/remove-image.riot
@@ -41,17 +41,16 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
         state.checked = props.checked;
       },
       deleteImage(ignoreError) {
-        // registryUI.taglist.go(name);
-        deleteImage(this.props.image, this.props.registryUrl, ignoreError)
+        deleteImage(this.props.image, this.props.registryUrl, ignoreError, this.props.onNotify)
       },
       handleCheckboxChange(checked) {
         this.props.handleCheckboxChange(checked, this.props.image);
       }
     }
 
-    export function deleteImage(image, registryUrl, ignoreError) {
+    export function deleteImage(image, registryUrl, ignoreError, onNotify) {
       if (!image.digest) {
-        // registryUI.snackbar('Information for ' + name + ':' + tag + ' are not yet loaded.');
+        onNotify(`Information for ${name}:${tag} are not yet loaded.`);
         return;
       }
       const name = image.name;
@@ -60,21 +59,24 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
       oReq.addEventListener('loadend', function () {
         if (this.status == 200 || this.status == 202) {
           router.taglist(name);
-          // registryUI.snackbar('Deleting ' + name + ':' + tag +
-          //   ' image. Run `registry garbage-collect config.yml` on your registry');
+          onNotify(`Deleting ${name}:${tag} image. Run \`registry garbage-collect config.yml\` on your registry`);
         } else if (this.status == 404) {
-          // ignoreError || registryUI.errorSnackbar('Digest not found for this image in your registry.');
+          ignoreError || onNotify({
+            message: 'Digest not found for this image in your registry.',
+            isError: true
+          });
         } else {
-          // registryUI.snackbar(this.responseText);
+          onNotify(this.responseText);
         }
       });
       oReq.open('DELETE', registryUrl + '/v2/' + name + '/manifests/' + image.digest);
       oReq.setRequestHeader('Accept',
         'application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json');
       oReq.addEventListener('error', function () {
-        registryUI.errorSnackbar(
-          'An error occurred when deleting image. Check if your server accept DELETE methods Access-Control-Allow-Methods: [\'DELETE\'].'
-        );
+        onNotify({
+          message: 'An error occurred when deleting image. Check if your server accept DELETE methods Access-Control-Allow-Methods: [\'DELETE\'].',
+          isError: true
+        });
       });
       oReq.send();
     }
diff --git a/src/components/tag-list/tag-list.riot b/src/components/tag-list/tag-list.riot
index 641a450..180644e 100644
--- a/src/components/tag-list/tag-list.riot
+++ b/src/components/tag-list/tag-list.riot
@@ -38,7 +38,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 
   <tag-table if="{ state.loadend }" tags="{state.tags}" asc="{state.asc}" page="{ state.page }"
     show-content-digest="{props.showContentDigest}" is-image-remove-activated="{props.isImageRemoveActivated}"
-    onReverseOrder="{ onReverseOrder }" registry-url="{ props.registryUrl }" pull-url="{ props.pullUrl }"></tag-table>
+    onReverseOrder="{ onReverseOrder }" registry-url="{ props.registryUrl }" pull-url="{ props.pullUrl }" on-notify="{ props.onNotify }"></tag-table>
 
   <pagination pages="{ getPageLabels(state.page, getNumPages(state.tags)) }" onPageUpdate="{onPageUpdate}"></pagination>
 
@@ -87,20 +87,20 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
           if (this.status == 200) {
             const tags = JSON.parse(this.responseText).tags || [];
             state.tags = tags.map(function (tag) {
-              return new DockerImage(props.image, tag, null, props.registryUrl);
+              return new DockerImage(props.image, tag, null, props.registryUrl, props.onNotify);
             }).sort(compare);
             window.requestAnimationFrame(self.onResize);
             self.update({
               page: Math.min(state.page, getNumPages(state.tags))
             })
           } else if (this.status == 404) {
-            // registryUI.snackbar('Server not found', true);
+            self.props.onNotify('Server not found', true);
           } else {
-            // registryUI.snackbar(this.responseText, true);
+            self.props.onNotify(this.responseText, true);
           }
         });
         oReq.addEventListener('error', function () {
-          // registryUI.snackbar(this.getErrorMessage(), true);
+          self.props.onNotify(this.getErrorMessage(), true);
           state.tags = [];
         });
         oReq.addEventListener('loadend', function () {
diff --git a/src/components/tag-list/tag-table.riot b/src/components/tag-list/tag-table.riot
index 4ad5372..37ebf0c 100644
--- a/src/components/tag-list/tag-table.riot
+++ b/src/components/tag-list/tag-table.riot
@@ -49,18 +49,21 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
           </td>
           <td if="{ props.showContentDigest }">
             <image-content-digest image="{ image }" />
-            <copy-to-clipboard target="digest" image="{ image }" pull-url="{ props.pullUrl }" />
+            <copy-to-clipboard target="digest" image="{ image }" pull-url="{ props.pullUrl }"
+              on-notify="{ props.onNotify }" />
           </td>
           <td>
             <image-tag image="{ image }" />
-            <copy-to-clipboard target="tag" image="{ image }" pull-url="{ props.pullUrl }" />
+            <copy-to-clipboard target="tag" image="{ image }" pull-url="{ props.pullUrl }"
+              on-notify="{ props.onNotify }" />
           </td>
           <td class="show-tag-history">
             <tag-history-button image="{ image }" />
           </td>
           <td if="{ props.isImageRemoveActivated }" class="remove-tag">
             <remove-image multi-delete="{ state.multiDelete }" image="{ image }" registry-url="{ props.registryUrl }"
-              handleCheckboxChange="{ onRemoveImageChange }" checked="{ state.toDelete.has(image) }" />
+              handleCheckboxChange="{ onRemoveImageChange }" checked="{ state.toDelete.has(image) }"
+              on-notify="{ props.onNotify }" />
           </td>
         </tr>
       </tbody>
@@ -106,7 +109,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
         state.page = props.page
       },
       bulkDelete() {
-        this.state.toDelete.forEach(image => deleteImage(image, this.props.registryUrl, true))
+        this.state.toDelete.forEach(image => deleteImage(image, this.props.registryUrl, true, this.props.onNotify))
       },
       onRemoveImageHeaderChange(checked, event) {
         if (event.altKey === true) {
diff --git a/src/index.html b/src/index.html
index 47265e3..7151673 100644
--- a/src/index.html
+++ b/src/index.html
@@ -1,5 +1,5 @@
 <!--
- Copyright (C) 2016-2019 Jones Magloire @Joxit
+ Copyright (C) 2016-2021 Jones Magloire @Joxit
 
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
diff --git a/src/index.js b/src/index.js
index 46b90b3..3c5c2c7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -7,6 +7,7 @@ import {
   MaterialButton,
   MaterialCheckbox,
   MaterialTabs,
+  MaterialSnackbar,
 } from 'riot-mui';
 
 import DockerRegistryUI from './components/docker-registry-ui.riot';
@@ -19,6 +20,7 @@ register('material-navbar', MaterialNavbar);
 register('material-spinner', MaterialSpinner);
 register('material-button', MaterialButton);
 register('material-checkbox', MaterialCheckbox);
+register('material-snackbar', MaterialSnackbar);
 register('material-tabs', MaterialTabs);
 
 const createApp = component(DockerRegistryUI);
diff --git a/src/scripts/docker-image.js b/src/scripts/docker-image.js
index 4ed2799..3a86d56 100644
--- a/src/scripts/docker-image.js
+++ b/src/scripts/docker-image.js
@@ -15,7 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 import { Http } from './http';
-import { isDigit, eventTransfer } from './utils';
+import { isDigit, eventTransfer, ERROR_CAN_NOT_READ_CONTENT_DIGEST } from './utils';
 import observable from '@riotjs/observable';
 
 const tagReduce = (acc, e) => {
@@ -46,12 +46,13 @@ export function compare(e1, e2) {
 }
 
 export class DockerImage {
-  constructor(name, tag, list, registryUrl) {
+  constructor(name, tag, list, registryUrl, onNotify) {
     this.name = name;
     this.tag = tag;
     this.list = list;
     this.registryUrl = registryUrl;
     this.chars = 0;
+    this.onNotify = onNotify;
     observable(this);
     this.on('get-size', function () {
       if (this.size !== undefined) {
@@ -97,7 +98,7 @@ export class DockerImage {
         if (response.mediaType === 'application/vnd.docker.distribution.manifest.list.v2+json') {
           self.trigger('list', response);
           const manifest = response.manifests[0];
-          const image = new DockerImage(self.name, manifest.digest, false, self.registryUrl);
+          const image = new DockerImage(self.name, manifest.digest, false, self.registryUrl, self.onNotify);
           eventTransfer(image, self);
           image.fillInfo();
           self.variants = [image];
@@ -114,14 +115,14 @@ export class DockerImage {
           self.digest = digest;
           self.trigger('content-digest', digest);
           if (!digest) {
-            // registryUI.showErrorCanNotReadContentDigest();
+            self.onNotify(ERROR_CAN_NOT_READ_CONTENT_DIGEST);
           }
         });
         self.getBlobs(response.config.digest);
       } else if (this.status == 404) {
-        // registryUI.errorSnackbar('Manifest for ' + self.name + ':' + self.tag + ' not found');
+        self.onNotify(`Manifest for ${self.name}:${self.tag} not found`, true);
       } else {
-        // registryUI.snackbar(this.responseText);
+        self.onNotify(this.responseText);
       }
     });
     oReq.open('GET', this.registryUrl + '/v2/' + self.name + '/manifests/' + self.tag);
@@ -152,9 +153,9 @@ export class DockerImage {
         self.trigger('creation-date', self.creationDate);
         self.trigger('blobs', self.blobs);
       } else if (this.status == 404) {
-        registryUI.errorSnackbar('Blobs for ' + self.name + ':' + self.tag + ' not found');
+        self.onNotify(`Blobs for ${self.name}:${self.tag} not found`, true);
       } else {
-        registryUI.snackbar(this.responseText);
+        self.onNotify(this.responseText);
       }
     });
     oReq.open('GET', this.registryUrl + '/v2/' + self.name + '/blobs/' + blob);
diff --git a/src/scripts/utils.js b/src/scripts/utils.js
index 6290a2d..9cdd87c 100644
--- a/src/scripts/utils.js
+++ b/src/scripts/utils.js
@@ -149,4 +149,13 @@ export function eventTransfer(from, to) {
 
 export function isDigit(char) {
   return char >= '0' && char <= '9';
+}
+
+export const ERROR_CAN_NOT_READ_CONTENT_DIGEST = {
+  message:
+    'Access on registry response was blocked. Try adding the header ' +
+    '`Access-Control-Expose-Headers: Docker-Content-Digest`' +
+    ' to your proxy or registry: ' +
+    'https://docs.docker.com/registry/configuration/#http',
+  isError: true,
 };
diff --git a/src/style.scss b/src/style.scss
index 79c1ddb..d182f75 100644
--- a/src/style.scss
+++ b/src/style.scss
@@ -21,6 +21,7 @@
 @import 'riot-mui/src/material-elements/material-button/material-button.scss';
 @import 'riot-mui/src/material-elements/material-checkbox/material-checkbox.scss';
 @import 'riot-mui/src/material-elements/material-tabs/material-tabs.scss';
+@import 'riot-mui/src/material-elements/material-snackbar/material-snackbar.scss';
 
 @import './roboto.scss';
 @import './material-icons.scss';