.bg-fondo {
  background-image: url("../img/fondo_azul.jpg") !important;
  background-repeat: no-repeat;
  background-size: cover; /* o contain, según lo que quieras */
  background-position: center;
  width: 100%;
  height: 300px;
}

.container-login {
  padding: 40px 22px !important;
}

@media screen and (max-width: 576px) {
  .container-login {
    width: 80% !important;
    padding: 30px 15px !important;
  }
}