code: def element_geom(
      pen=None,
      brush=None,
      paper=None,
      # ToDo: fatten
  ) -> dict:
      """
      Specify new values for the named colors.
  
      Parameters
      ----------
      pen : str
          Color to use by name "pen".
      brush : str
          Color to use by name "brush".
      paper : str
          Color to use by name "paper".
  
      Returns
      -------
      `dict`
          Theme element specification.
  
      Examples
      --------
      .. jupyter-execute::
          :linenos:
          :emphasize-lines: 7
  
          import numpy as np
          from lets_plot import *
          LetsPlot.setup_html()
          np.random.seed(42)
          data = {'x': np.random.normal(size=1000)}
          ggplot(data, aes(x='x')) + geom_histogram(color='pen', fill='paper') + \\
              theme(geom=element_geom(pen='dark_blue', paper='light_blue'))
  
      """
      return locals()
  
file_path: lets-plot/python-package/lets_plot/plot/theme_.py
imports: from .core import FeatureSpec
label_desc: Use image node_id 8 for calling a global function with example usage: element_geom(pen, brush, paper) and returns: locals