<div>
    I'm centered
    <div>
        I'm glued to the centered div
    </div>
</div>

div
{
  background-color: pink;
  width: 300px;
  height: 400px;
  margin: 0 auto;
  position: relative;
}
div div
{
  width: 100px;
  height: 100px;
  background-color: cyan;
  left: -100px;
  top: 0px;
  position: absolute;
}