body {
  font-family: Arial, sans-serif;
}

.hero {
  position: relative;
  background: url("../img/nuevasonrisa.jpeg") center/cover no-repeat;
  color: white;
  text-align: center;
  padding: 80px 20px;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1;
}

.hero * {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: bold;
}

.services h3 {
  margin-top: 20px;
}

footer {
  background: #0d6efd;
  color: white;
  padding: 20px;
  text-align: center;
}

.whatsapp-btn {
  background: #25D366;
  color: white;
  padding: 12px 25px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: bold;
}