Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

.instagram-picture .wrapp-picture a {
  display: flex;
  align-items: center;
  justify-content: center;
}
.instagram-picture .wrapp-picture a:after {
  content: "\f163";
  font-family: woodmart-font;
  font-size: 60px;
  color: white;
  transition: all .3s ease;
  opacity: 0;
}
.instagram-picture:hover .wrapp-picture a:after  {
  opacity: 1;
}

Best Regards