By default, size of social buttons is 32 x 32 pixels.
You can change it as you want, for example: 20 x 20.
Please add this code to Custom CSS field in Content Views >> Settings page:
.pt-cv-social-buttons a{width:20px!important;height:20px!important;background-size:100px!important}
.pt-cv-social-buttons .pt-cv-social-twitter{background-position:-20px 0!important}
.pt-cv-social-buttons .pt-cv-social-linkedin{background-position:-60px 0!important}
.pt-cv-social-buttons .pt-cv-social-pinterest{background-position:-80px 0!important}
.pt-cv-social-buttons .pt-cv-social-googleplus {background-position: -40px 0;}
