Answers for "how to apply a gradient fill to a div that without an image in css"

gradient over image css

#linear-gradient-over-image{
    background-image: linear-gradient(to bottom, black, white), 
      url('images/background.jpg');
    background-size: cover;
}

linear gradient css background image

background-image: url("IMAGE_URL"), linear-gradient(#eb01a5, #d13531);