Social Icons Not Sizing Responsively

I really like this plugin and all its customization capabilities, but after installing and setting up the plugin I noticed that it doesn’t resize responsively. I’m using the shortcode in a text block to place the icons on the Home page. When I resize the screen the icons don’t resize but their container does. Is there any way to fix this? I have to have this site ready to go live really soon.

Here is the link to the development site I’m working on:

https://www.ads-software.com/plugins/ultimate-social-media-icons/