.imagen{
    width: 100%;
    /* margin: 1rem 0 1rem 1rem; */
    height: calc(100vh - 0rem);
    border-radius: 0;
    position: relative;
    align-items: center;
    justify-content: center;
    display: flex;
    /* background-image:  url("fondo_large-SS.png") ; */
    background-image:  url("granos.png") ;
    background-position: 1% 1%;
    background-size: cover;
    background-repeat: no-repeat;
}

.logo{
    margin: 5rem;
    margin-top: auto;
    margin-bottom: auto;
    text-align: center;
    width: 60%;
    z-index: 100;
}

.formulario{
    padding: 3rem;
    display: flex;
    align-items: center;
}

.form_centrado{
    width: 500px;
    margin-left: auto;
    margin-right: auto;

}

.btn_usuario{
    margin-top: 3rem;
}

.btn_contrasena{
    margin-top: 1rem;
}

.btn{
    margin-top: 2rem;
    background-color:#9f4349;
    border-color: #9f4349;
}

.form-control{
    background-color:#f1f2f3 !important;
    border: 0px
}