center image with position absolute

1.wrapper img {
2  left: 50%;
3  transform: translate(-50%,0);
4  position: absolute;
5  z-index: 1 
6}

1.center{
2    margin: 0;
3    position: absolute;
4    top: 50%;
5    left: 50%;
6    -ms-transform: translate(-50%, -50%);
7    transform: translate(-50%, -50%);
8}