body {
  margin: 0;
  font-family: Tahoma, sans-serif;
  background: linear-gradient(to bottom right, #0f0f0f, #1a1a2e);
  color: white;
  text-align: center;
}

header {
  padding: 2em;
}

.cta-buttons a {
  display: inline-block;
  margin: 1em;
  padding: 0.8em 1.5em;
  border-radius: 30px;
  text-decoration: none;
  font-weight: bold;
  color: white;
}

a.whatsapp { background-color: #25D366; }
a.gmail { background-color: #4285F4; }

.cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: 2em;
}

.card {
  background-color: rgba(255,255,255,0.1);
  border: 1px solid #ffd700;
  margin: 1em;
  padding: 1.5em;
  border-radius: 12px;
  width: 280px;
}

footer {
  margin-top: 4em;
  padding: 1em;
  border-top: 1px solid #333;
  font-size: 0.8em;
  color: #bbb;
}