.header-clasico {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #6aaef1;
  padding: 20px;
}
.header-clasico nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #333;
}
.header-moderno {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 5%;
  background: #2c3e50;
  color: rgba(5, 34, 163, 0.048);
}
.btn-contacto {
  background: #0992e2;
  padding: 8px 15px;
  border-radius: 5px;
}
.hero-basico {
  text-align: center;
  padding: 100px 20px;
  background-color: #15aec2;
}
.hero-basico button {
  margin-top: 20px;
  font-size: 1.2em;
}
.grilla-servicios {
  display: flex;
  justify-content: center;
  gap: 30px;
  padding: 50px;
}
.card {
  border: 1px solid #ccc;
  padding: 20px;
  width: 250px;
  text-align: center;
}
<footer class="footer-social">
  <div>Síguenos en:</div>
  <a href="#">Facebook</a> | <a href="#">Instagram</a>
</footer>