Increase social media icons in mobile menu

Site URL: https://www.soulslicepizza.com

I'm trying to increase the icon size for the social media buttons at the bottom of the mobile menu. I'm having trouble identifying the class and proper CSS for this. 

Any help is appreciated.

Adjust the width and height properties of the css below. Make sure they're the same value.

CSS

/* Overrides icon size in mobile menu */
.header-menu-actions .icon--lg {
  width: 28px;
  height: 28px;
}

See article on how to add CSS https://support.squarespace.com/hc/en-us/articles/206545567