가운데 정렬하기 위한 less Mixin

centered_mixin.less

.wrapped {
  position: relative;
  width: 100%;
  height: 100%;
}

.centered (@width, @height) {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -(@height / 2) 0 0 -(@width / 2);
}