body { background-color:#ECF0F1;}
#pop {
  margin: 300px auto;
  display: block;
  width: 75px;
  height: 75px;
}

#pop .primary {
  background-image: url(share.jpg);
  background-size: contain;
  border-radius: 50%;
  width: 75px;
  height: 75px;
  margin: auto;
  display: block;
}

#pop .secondary {
  background-image: url(twitter.png);
  background-size: contain;
  height: 35px;
  width: 35px;
  display: block;
}