app.py

import gradio as gr

def greet(name):
    return "Hello " + name + "!!"

iface = gr.Interface(
    fn=greet,
    inputs="text",
    outputs=gr.HighlightedText(
        label="Diff",
        combine_adjacent=True,
        show_legend=True,
        color_map={"+": "red", "-": "green"}),
)
iface.launch()