diff --git a/.storybook/preview.jsx b/.storybook/preview.jsx
index a921bcb..2ab41bd 100644
--- a/.storybook/preview.jsx
+++ b/.storybook/preview.jsx
@@ -97,6 +97,11 @@ export const parameters = {
   a11y: {
     config: {
       rules: [
+        {
+          // TODO: for now the user avatar background color is generated with a simple algorithm but does not respect the ratio
+          id: 'color-contrast',
+          selector: '*:not(.MuiAvatar-circular.UserAvatar)',
+        },
         {
           // A layout footer button targets a theming modal that we do not render to keep things simple, ignore this button violation
           id: 'aria-valid-attr-value',
diff --git a/src/app/(public)/assistant/AssistantPage.stories.tsx b/src/app/(public)/assistant/AssistantPage.stories.tsx
index 0cc0c35..0004338 100644
--- a/src/app/(public)/assistant/AssistantPage.stories.tsx
+++ b/src/app/(public)/assistant/AssistantPage.stories.tsx
@@ -23,7 +23,7 @@ async function playFindPlaceholerElement(canvasElement: HTMLElement): Promise<HT
 }
 
 async function playFindFirstMessageElement(canvasElement: HTMLElement): Promise<HTMLElement> {
-  return await within(canvasElement).findByText(/voluptatem/i);
+  return await within(canvasElement).findByText(/numquam/i);
 }
 
 const Template: StoryFn<ComponentType> = (args) => {
diff --git a/src/components/Avatar.tsx b/src/components/Avatar.tsx
index f8aeaf6..bc787f0 100644
--- a/src/components/Avatar.tsx
+++ b/src/components/Avatar.tsx
@@ -49,7 +49,12 @@ export const Avatar = (props: AvatarProps) => {
   }, [props.size]);
 
   return (
-    <MuiAvatar sx={{ width: size, height: size, fontSize: size / 2, bgcolor: stringToColor(props.fullName), ...(props.sx || {}) }} src={props.src}>
+    <MuiAvatar
+      className="UserAvatar"
+      sx={{ width: size, height: size, fontSize: size / 2, bgcolor: stringToColor(props.fullName), ...(props.sx || {}) }}
+      src={props.src}
+      alt={props.src ? '' : undefined}
+    >
       {props.src ? null : extractInitials(props.fullName)}
     </MuiAvatar>
   );
diff --git a/src/components/FlashMessage.stories.tsx b/src/components/FlashMessage.stories.tsx
index 695cd45..31393ae 100644
--- a/src/components/FlashMessage.stories.tsx
+++ b/src/components/FlashMessage.stories.tsx
@@ -25,7 +25,7 @@ DevelopmentEnvStory.args = {
   nodeEnv: 'production',
 };
 DevelopmentEnvStory.play = async ({ canvasElement }) => {
-  await within(canvasElement).findByText(/version/i);
+  await within(canvasElement).findByText(/merci/i);
 };
 
 export const DevelopmentEnv = prepareStory(DevelopmentEnvStory);
@@ -35,5 +35,8 @@ ProductionEnvStory.args = {
   appMode: 'prod',
   nodeEnv: 'production',
 };
+ProductionEnvStory.play = async ({ canvasElement }) => {
+  await within(canvasElement).findByText(/merci/i);
+};
 
 export const ProductionEnv = prepareStory(ProductionEnvStory);