Replace an image with CSS

Use the following CSS code:

img {
  display: block;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  background: url([LINK TO NEW IMG]) no-repeat;
  width: 180px; /* Width of new image */
  height: 236px; /* Height of new image */
  padding-left: 180px; /* Equal to width of new image */
}

Source: https://css-tricks.com/replace-the-image-in-an-img-with-css/