block middle css 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 ing with block display

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