code: def color_negative_red(val):
      """
      Takes a scalar and returns a string with
      the css property `'color: red'` for negative
      strings, black otherwise.
      """
      color = "red" if val < 0 else "black"
      return "color: %s" % color
  
imports: import numpy
  import pandas
  import streamlit
label_desc: Use image node_id 1 for calling a global function with example usage: color_negative_red(val) and returns: unknown