.banner-tema {
    background-image: linear-gradient(
            to right,
            rgba(0, 0, 0, 0.9),
            60%,
            transparent 100%
        ),
        linear-gradient(
            to left,
            rgba(255, 255, 255, 0.4),
            30%,
            transparent 100%
        ),
      url(../img/capa.jpg)
}