css component not centered code example

Example 1: how to center an ing with block display

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

Example 2: center with css

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