Change clor of the button icons

Add this code to the Custom CSS field on the Style tab of your Social Share Buttons widget’s settings:

.eapps-social-share-buttons-item-icon-container svg,
.eapps-social-share-buttons-item-icon-container path,
.eapps-social-share-buttons-item-icon-container rect { 
  fill: #4F4F4F !important; 
}