.fa {
  padding: 5px;
  font-size: 35px;
  width: 45px;
  text-align: center;
  text-decoration: none;
  margin: 5px 2px;
  border-radius: 100%;
}

.fa:hover {
    opacity: 0.7;
}


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

.fa-google {
  background: #dd4b39;
  color: white;
}

.fa-linkedin {
  background: #007bb5;
  color: white;
}
.fa-github {
  background: #000000;
  color: white;
}