how to change background color to background image in css code example

Example 1: how to change the page background in css

body {
  /* this changes the page's background to green  */
  background-color: green;
}

Example 2: background url with color css

background: linear-gradient(0deg, rgba(2,173,231,0.5), rgba(2,173,231,0.5)), url(images/mba-grid-5px-bg.png) repeat;