code: function initStyle(opt_config) {
    var config = objects.clone(defaultConfig);
    if (opt_config) {
      objects.merge(config, opt_config);
    }
    var attrName = config.attributeName;
    var selector = '[' + attrName + ']';
    var rules = {};
    rules[selector] = {'display': 'none !important'};
    ui.createStyle(rules);
  }
docs: Creates the styles used for toggling dates. Permits usage of datetoggle
  without needing to manually add styles to the page. You can optionally
  call this at the top of the page to avoid FOUC.