"opts":{
  /*
    Default options
  */
  "theme_opts":{
    "title": "Ankdev", 
    /* 
      Instead of only string you can pass html element like 
      <img src="src to your img relative to the output path" class="my-custom-class"/>
      Path must be relative to the output file (relative to generated html files.) you 
      can use the absolute path.
      Note: If you use html the default overwrite. Also for custom class you have to create 
      a class using create_style.This is shown below.
    */

   "filter": false, /*  The default value is true. This will turn the color of image white. 
      If you did not want any
      filter set it to false.
   */
  
  
  // You can create custom style which will overwrite the exisiting class property.
  "create_style": "nav{background: yellow}" +     // This will change the background color of sidebar.
                  ".my-custom-class{ filter: brightness(10) grayscale(100%)}", // This will apply filter to my-custom-class
  
  //You can add path of your style file. Note it must be relative to your output file. (relative to generated html files.)
  "add_style_path": ["../custom.css"] // Pass array or path

  // You can add custom script to html
  "add_scripts": "function foo(){console.log('foo')}",

  // You can add path of your script file. Note it must be relative to your output file. (relative to generated html files.)
  "add_script_path": ["../custom.js"] // Pass array or path
  
  "footer": "This is footer",   // Here again you can pass html element 
  }
}