div {
    border-style: dashed;
    border-color: red;
    border-width: 10px;
    width: 300px;
    height: 300px;
    margin: 20px;
    color: white;


}

div:nth-child(2) {
    background-origin: border-box;
    background-color: darkblue;
    background-image: url(imgs_fondos/perro.png);
    background-repeat: no-repeat;
}

div:nth-child(3) {
    background-color: darkblue;
    background-image: url(imgs_fondos/perro.png);
    background-repeat: no-repeat;
    background-position: bottom right;
}

div:nth-child(4) {
    background-color: darkblue;
    background-image: url(imgs_fondos/perro.png);
    background-repeat: no-repeat;
    background-position: 30px 30px;
}

div:nth-child(6) {
    background-clip: border-box;
    background-image: url(imgs_fondos/perro.png);
    background-repeat: round;
}

div:nth-child(7) {
    background-image: url(imgs_fondos/perro.png);
    background-clip: padding-box;
}

div:nth-child(8) {
    background-clip: content-box;
    background-image: url(imgs_fondos/perro.png);
    background-position: center;
    padding: 10px;
    /* Casi lo tengo, pero no es esto lo que necesito. Debo consultar más. */
}

div:nth-child(10) {
    border: 0px;
    background-image: url(imgs_fondos/lupa.png), url(imgs_fondos/perro.png), url(imgs_fondos/panda.png), url(imgs_fondos/zorro.png);
    background-repeat: repeat, no-repeat, no-repeat, repeat;
    background-position: center, bottom right, center, center;
}