.alerta-correo {
    display: none;
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #1d1d1d;
    color: white;
    padding: 15px 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    font-family: sans-serif;
    opacity: 0;
    transition: opacity 0.5s ease;
  }

  .alerta-correo.mostrar {
    display: block;
    opacity: 1;
  }

  .alerta-correo.ocultar {
    opacity: 0;
    transition: opacity 0.5s ease;
  }