/* footer.css */
.site-footer {
  background-color: #333333;
  color: #ffffff;
  padding: 2em 1em;
}
.footer-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}
.footer-column {
  flex: 1 1 200px;
  margin: 0.5em;
}
.footer-column h4 {
  margin-bottom: 0.5em;
  font-size: 1.1em;
}
.footer-column p {
  margin: 0.3em 0;
  line-height: 1.4;
}
.site-footer a {
  color: #ffffff;
  text-decoration: none;
}
.site-footer a:hover {
  color: #b71c1c;
}

/* Reemplaza tu regla .icon por esta: */
.footer-container .icon {
  width: 20px;
  vertical-align: middle;
  margin-right: 8px;
  filter: brightness(0) invert(1);
  -webkit-filter: brightness(0) invert(1);
}