code: def load_css_templates() -> None:
      """Loads 2 css templates to demonstrate the feature"""
      print("Creating default CSS templates")
  
      obj = (
          db.session.query(CssTemplate)
          .filter_by(template_name="Flat")
          .first()
      )
      if not obj:
          obj = CssTemplate(template_name="Flat")
          db.session.add(obj)
      css = textwrap.dedent(
          """\
      .navbar {
          transition: opacity 0.5s ease;
          opacity: 0.05;
      }
      .navbar:hover {
          opacity: 1;
      }
      .chart-header .header{
          font-weight: @font-weight-normal;
          font-size: 12px;
      }
      /*
      var bnbColors = [
          //rausch    hackb      kazan      babu      lima        beach     tirol
          '#ff5a5f', '#7b0051', '#007A87', '#00d1c1', '#8ce071', '#ffb400', '#b4a76c',
          '#ff8083', '#cc0086', '#00a1b3', '#00ffeb', '#bbedab', '#ffd266', '#cbc29a',
          '#ff3339', '#ff1ab1', '#005c66', '#00b3a5', '#55d12e', '#b37e00', '#988b4e',
       ];
      */
      """
      )
      obj.css = css
      db.session.commit()
  
      obj = (
          db.session.query(CssTemplate)
          .filter_by(template_name="Courier Black")
          .first()
      )
      if not obj:
          obj = CssTemplate(template_name="Courier Black")
          db.session.add(obj)
      css = textwrap.dedent(
          """\
      h2 {
          color: white;
          font-size: 52px;
      }
      .navbar {
          box-shadow: none;
      }
      .navbar {
          transition: opacity 0.5s ease;
          opacity: 0.05;
      }
      .navbar:hover {
          opacity: 1;
      }
      .chart-header .header{
          font-weight: @font-weight-normal;
          font-size: 12px;
      }
      .nvd3 text {
          font-size: 12px;
          font-family: inherit;
      }
      body{
          background: #000;
          font-family: Courier, Monaco, monospace;;
      }
      /*
      var bnbColors = [
          //rausch    hackb      kazan      babu      lima        beach     tirol
          '#ff5a5f', '#7b0051', '#007A87', '#00d1c1', '#8ce071', '#ffb400', '#b4a76c',
          '#ff8083', '#cc0086', '#00a1b3', '#00ffeb', '#bbedab', '#ffd266', '#cbc29a',
          '#ff3339', '#ff1ab1', '#005c66', '#00b3a5', '#55d12e', '#b37e00', '#988b4e',
       ];
      */
      """
      )
      obj.css = css
      db.session.commit()
  
imports: import textwrap
  from superset import db
  from superset.models.core import CssTemplate
label_desc: Use image node_id 1 for calling a global function with example usage: load_css_templates() without return types