#btn-face1 {
  background-image: url("/images/links_externos/face.jpg");
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}
#btn-face2 {
  background-image: url("/images/links_externos/face.jpg") !important;
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}

#btn-twitter1 {
  background-image: url("/images/links_externos/twitter.jpg");
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}
#btn-twitter2 {
  background-image: url("/images/links_externos/twitter.jpg") !important;
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}

#btn-youtube1 {
  background-image: url("/images/links_externos/youtube.jpg");
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}
#btn-youtube2 {
  background-image: url("/images/links_externos/youtube.jpg") !important;
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
}