.footer {
  background: 
    url('../media/moldura/molde_40.jfif') no-repeat center center,
    rgb(213, 223, 230);
  background-size: 100%;
  background-blend-mode: luminosity; /* luminosity */
  color: white;
  padding: 40px 0;
}

/* Sua sobreposição */
.footer-overlay {
  background-color: rgba(0, 0, 0, 0.6);
  padding: 40px 0;
}

.footer .social-link {
  display: inline-block;
  margin: 5px;
  padding: 8px 12px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  color: white;
}