update css styling

app.py

@@ -5,6 +5,13 @@ from transformers import AutoProcessor, Blip2ForConditionalGeneration
 import torch
 
 
+css = """
+#input_prompt {
+  position: fixed;
+  bottom: 0;
+  width: 100%;
+}
+"""
 processor = AutoProcessor.from_pretrained("Salesforce/blip2-opt-2.7b")
 # by default `from_pretrained` loads the weights in float32
 # Loading in float16 instead to save memory