.img-bordeado{ border: 1px solid #ddd;
}
.img-bg-oscuro{ background-color: #000;
}
.cuadrado, .horizontal{ position: relative; padding: 25px; display: block; height: calc(100% - 25px);
}
.cuadrado img{ max-height: 120px;
}
.horizontal img{ max-height: 70px;
}
@media(min-width:576px){
    .cuadrado, .horizontal{ height: 100%;
    }
}

/**/

.caja-descarga{ height: 100%; padding: 35px; background-color: #F4F7FC; 
}
.caja-descarga .encab{ font-size: 1rem; font-weight: 700; margin-bottom: 1rem;
}
.caja-descarga ul{ padding-left: 1rem; margin: 0;
}