how to centre the image in css inside div tag code example

Example 1: align image to the center of the screen

.centered {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

Example 2: image center in div

img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 40%;
}