text shadow for little vGL

void text_shadows_demo(void)
{
    static lv_style_t label_style;
    lv_style_copy(&label_style, &lv_style_plain);
    label_style.text.opa = LV_OPA_50;
    /*Create a label for the shadow first (it's in the background*/
    lv_obj_t* shadow_label = lv_label_create(lv_scr_act(), NULL);
    lv_label_set_style(shadow_label, LV_LABEL_STYLE_MAIN, &label_style);
    /*Create the main label*/
    lv_obj_t* main_label = lv_label_create(lv_scr_act(), NULL);
    lv_label_set_text(main_label, "A simple method to create\n"
        "shadows on text\n"
        "It even works with\n\n"
        "newlines and     spaces.");

    /*Set the same text for the shadow label*/
    lv_label_set_text(shadow_label, lv_label_get_text(main_label));
    /*Position the main label*/
    lv_obj_align(main_label, NULL, LV_ALIGN_CENTER, 0, 0);

    /*Shift the second label down and to the right by 1 pixel*/
    lv_obj_align(shadow_label, main_label, LV_ALIGN_IN_TOP_LEFT, 3, 3);
}