To install the style, follow these steps:
- Copy/Paste the style code into a text file
- Save the text file as custom.css
- Copy the custom.css file to JOOMLA\administrator\templates\bluestork\css where "JOOMLA" is the name of your Joomla! installation directory
- Edit the index.php file for JOOMLA\administrator\templates\bluestork\index.php where "JOOMLA" is the name of your Joomla! installation directory. Near the top of index.php file is a section containing the other CSS files used by the template. Find this section:

$doc->addStyleSheet('templates/system/css/system.css');
$doc->addStyleSheet('templates/'.$this->template.'/css/template.css');

then add the line for the custom.css file. Like so:

$doc->addStyleSheet('templates/system/css/system.css');
$doc->addStyleSheet('templates/'.$this->template.'/css/template.css');
$doc->addStyleSheet('templates/'.$this->template.'/css/custom.css');

Save your modified index.php file.
- Refresh your browser or open/close Joomla! backend Administrator for the style to take effect

Tested functional for the latest versions of Firefox, Chrome and Opera on Windows 7 operating system. Fails miserably on IE and is too quirky to be useful on Safari.