$array = array(
      'selected_state' => 'style-class-name',
      'variable'   => 'variablename',
      'uppercase' => '1' // transform to uppercase
      'onclick' => $onclick, // this must be an object or an array of objects
      'style' => 'style-class-name',
      );
      

      $array = array(
      'margin' => '0 0 0 0',
      'padding' => '0 0 0 0',
      'width' => '200', // or 100%
      'height' => '400',
      'max_height' => '500',
      'background-color' => '#ffffff',
      'background-image' => 'filename.png',
      'background-size' => 'cover', // or 'contain', 'top' (default)
      'crop' => 'round', // or 'yes'
      'vertical-align' => 'middle',
      'text-align' => 'center',
      'font-size' => '14',
      'font-ios' => 'Roboto',
      'font-weight' => 'Bold',
      'font-style' => 'Italic',
      'font-android' => 'Roboto',
      'color' => '#000000',
      'white-space' => 'nowrap',
      'children_style' => 'style-class-name' // this is used only in menu, progress and field-list components
      'floating' => '1',
      'float' => 'right',
      'parent_style' => 'style-class-name',
      'shadow-color' => '#000000',
      'shadow-offset' => '0 1',
      'shadow-radius' => '5',
      'border-width' => '1',
      'border-color' => '#000000',
      'border-radius' => '4',
      'opacity' => '0.4',
      );