html align image in center of div code example

Example 1: center div horizontally and vertically

.parent {
  position: relative;
}
.child {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

Example 2: how to center an image element inside a block in css

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