image style middle code example

Example 1: center an image horizontally and vertically

.center{
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}

Example 2: center image css

.centerImg {
  display: block;
  margin: 0 auto;
}