*{
    box-sizing: border-box;
    margin:0;
    padding: 0;
}
.contenido {
    margin-top: 5px; /* ajusta según la altura total de top-bar + menú */
    padding: 20px;
}
.portada_vincula{ 
    background-image: url('../img/vincula.jpg');
    background-size: 100%;
    background-position: center;
    background-repeat: no-repeat;
    width: 900px;
    height: 450px;
    margin: 0 auto;
}
.container{ 
    display: flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
}
.titulo_vincula { 
    text-align: center;
    color:#003752;
    text-transform: uppercase;
    font-size: 30px;
    margin-top: 30px;
    margin-bottom: 30px;
    font-weight: 200;
}

.descripcion_vincula{ 
    text-align: justify;
    color:#858585;
    width:900px;
    font-size: 16px;
    line-height: 2.5rem;
}
.titulo_testimonio { 
    padding: 20px;
    margin-top: 40px;
    margin-bottom: 40px;
    text-align: center;
    color:#003752;
    font-weight: 200;
    font-size: 30px;;
}

@media screen and (max-width : 750px){
    .portada_vincula{ 
        width: 100%;
        height: auto;
        aspect-ratio: 2/1;
    }
    .descripcion_vincula { 
        text-align: justify;
        color:#858585;
        width:380px;
        font-size: 16px;
        line-height: 1.8rem;
        padding: 10px;;
    }
}
@media screen and (max-width: 991px) and (min-width: 751px) {
    .portada_vincula{ 
        width: 100%;
        height: auto;
        aspect-ratio: 2/1;
    }

    .descripcion_vincula { 
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
    }

}