.fa {
  padding: 10px;
  font-size: 20px;
  width: 50px;
  text-align: center;
  text-decoration: none;
  margin: 5px 2px;
  border-radius: 50%;
}
.fa:hover {
    opacity: 0.7;
}
.fa-pinterest {
  background: #cb2027;
  color: white;
}
.fa-twitter {
  background: #55ACEE;
  color: white;
}
.fa-instagram {
  background: #125688;
  color: white;
}