In my twely.org website I have unwanted css in header. The unwanted CSS file is coming form wp\_head. How can I remove the below stylesheets?

```
<link rel='stylesheet' id='themify-shortcodes-css'  href='http://www.twely.org/wp-content/themes/elemin/themify/css/shortcodes.css?ver=1.5.8' type='text/css' media='all' />

<link rel='stylesheet' id='pretty-photo-css'  href='http://www.twely.org/wp-content/themes/elemin/themify/css/lightbox.css?ver=3.8' type='text/css' media='all' />

```