body {
  background-color: #e3e3e3;
  background-image: url("../img/bg-gris-marmol.jpg");
}
.logo {
  max-width: 190px;
  max-height: 190px;
}
.contenedor__logo {
  display: flex;
  justify-content: center;
  height: 100vh;
  align-items: center;
}