.contenedor {min-height: 100vh;}

.fondo {
 width: calc(100% - 750px);
 background-repeat: no-repeat;
 background-size: cover;
 background-position: center;
 position: relative;
 z-index: 1;
}

.login-logo { z-index: 2; height: 84px; }
.compact-form { transform: scale(0.875); }
@media(max-width:1024px) { .login-logo { height: 60px; } }
@media(max-width:640px) { .login-logo { height: 36px; } .fondo { height:70px; } }