html {
  font-size: 20px;
}

body:after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  width: 100%;
  height: 100vh;
  margin: 0;
  transition: background-image 4s;
  background: no-repeat center center fixed;
  background-size: cover;
}

body.coffee:after {
  background-image: url('coffee.jpeg');
}

body.code:after {
  background-image: url('code.jpeg');
}

.coffee .social {
  background-color: rgba(255 ,255, 255, 0.2);
}

.code .social {
  background-color: rgba(0, 0, 0, 0.7);
}

.social {
  position: absolute;
  border-radius: 1em;
  padding: .5em;
  bottom: 2em;
  right: 2em;
  transition: background-color 2s;
}

a {
  text-decoration: none;
}

a:hover {
  opacity: 0.5;
}

.fa-github, .fa-facebook, .fa-linkedin, .fa-twitter {
  color: white;
}

.linkedin .fa-circle {
  color: #0077B5;
}

.github .fa-circle {
  color: #24292e;
}

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

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