Remove hyperlink from shortcode

Apologies for the novice question; I am new to Wordpress and PHP.

I've been using the following:

<?php echo do_shortcode('[shortcode]')?>

to display a shortcode. My problem, however, is that, as the icons act as pointers to other webpages or protocols (like email), they are displayed as an icon with an underline beneath them.

I still want them to point to somewhere but I don't want the underline to be visible. Looking in the CSS files for the plugin itself, it does have

text-decoration: none;

but this doesn't seem to affect anything. Wordpress also states that the stylesheet for the plugin is inactive. I'm not quite sure how to add a class to this effect for the anchor on the primary stylesheet (i.e. for the webpage itself) but I was hoping that would be the solution.

via Chebli Mohamed