Questions about LVGL & examples of V5 Displays

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lv_obj_t * myButton= lv_btn_create(lv_scr_act(), NULL);
lv_style_t myButtonStyleREL; //relesed style
lv_style_t myButtonStylePR; //pressed style

function createButton()
{
    lv_style_copy(&myButtonStyleREL, &lv_style_plain);
    myButtonStyleREL.body.main_color = LV_COLOR_MAKE(150, 0, 0);
    myButtonStyleREL.body.grad_color = LV_COLOR_MAKE(0, 0, 150);
    myButtonStyleREL.body.radius = 0;
    myButtonStyleREL.text.color = LV_COLOR_MAKE(255, 255, 255);

    lv_style_copy(&myButtonStylePR, &lv_style_plain);
    myButtonStylePR.body.main_color = LV_COLOR_MAKE(255, 0, 0);
    myButtonStylePR.body.grad_color = LV_COLOR_MAKE(0, 0, 255);
    myButtonStylePR.body.radius = 0;
    myButtonStylePR.text.color = LV_COLOR_MAKE(255, 255, 255);

    lv_btn_set_style(myButton, LV_BTN_STYLE_REL, &myButtonStyleREL); //set the relesed style
    lv_btn_set_style(myButton, LV_BTN_STYLE_PR, &myButtonStylePR); //set the pressed style
    lv_obj_set_size(myButton, 200, 50); //set the button size
}

Also here is a tutorial that I made tutorial. It explains all the basics of lvgl.