footer {
  padding: 50px 0; }

footer .copyright {
  font-size: 16px;
  font-style: italic;
  font-weight: 300;
}

  footer .copyright strong {
    font-weight: 600;
  }

  footer .sign img {
    opacity: .15;
    filter: opacity(15);
    -webkit-transition: all 0.2s ease-in;
    -moz-transition: all 0.2s ease-in;
    -o-transition: all 0.2s ease-in;
    transition: all 0.2s ease-in;
  }

  footer .sign img:hover {
    opacity: 1;
    filter: opacity(100);
  }