.fa {
  padding: 10px;
  font-size: 30px;
  width: 50px;
  text-align: center;
  text-decoration: none;
  
}

.fa:hover {
    opacity: 0.7;
}

.fa-facebook {
  background: #3B5998;
  color: white;
}

.fa-twitter {
  background: #55ACEE;
  color: white;
}

.fa-linkedin {
  background: #007bb5;
  color: white;
}

.fa-instagram {
  background: #125688;
  color: white;
}