how to store a background-image gradient in css variable code example

Example 1: background with image and gradient

body {
  background: #eb01a5;
  background-image: url("IMAGE_URL"); /* fallback */
  background-image: url("IMAGE_URL"), linear-gradient(#eb01a5, #d13531); /* W3C */
}

Example 2: background image with gradient css

.background_img {
    background-image: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.2)), url(../Image/bg.jpg);
    /* background-image: url(../Image/bg.jpg); */
    width: 100%;
    height: auto;
    background-repeat: no-repeat !important;
    background-size: cover !important;
    background-position: center !important;
}