Update app.py

app.py

@@ -70,7 +70,7 @@ with gr.Blocks(title="Mistral Playground", css=css) as mistral_playground:
             gr.Markdown("Thinktecture Mistral AI Playground", elem_classes="header-text")
             
     with gr.Row():
-        api_key = gr.Textbox(lines=1, label="Mistral API Key")
+        api_key = gr.Textbox(type='password', placeholder='Your Mistral AI API key', lines=1, label="Mistral AI API Key")
         model = gr.Radio(
             choices=["mistral-tiny", "mistral-small", "mistral-medium"],
             value="mistral-tiny",