body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f1f3f4;
  color: #202124;
}

nav#menu {
  background-color: #ffffff;
  padding: 1rem;
  border-bottom: 1px solid #dadce0;
  text-align: center;
}

nav#menu a {
  margin: 0 15px;
  color: #1a73e8;
  text-decoration: none;
  font-weight: bold;
}

header {
  background-color: #ffffff;
  padding: 1rem;
  text-align: center;
  border-bottom: 1px solid #dadce0;
}

#carpetas {
  text-align: center;
  margin: 1rem 0;
}

#carpetas button {
  margin: 5px;
  padding: 0.6rem 1.2rem;
  background-color: #e8f0fe;
  color: #1a73e8;
  border: 1px solid #c3dafe;
  border-radius: 5px;
  cursor: pointer;
}

#carpetas button:hover {
  background-color: #d2e3fc;
}

main#contenido {
  max-width: 800px;
  margin: auto;
  padding: 1rem;
}

.correo {
  background-color: #ffffff;
  border: 1px solid #dadce0;
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 8px;
}

.correo h3 {
  margin-top: 0;
  color: #1a73e8;
}

footer {
  background-color: #ffffff;
  text-align: center;
  padding: 1rem;
  border-top: 1px solid #dadce0;
  font-size: 0.9rem;
  margin-top: 2rem;
}