[Deff]

<style>
 body{
  width:100%;
  margin: 0;
  padding:0;
}
 #pun {
  border:red solid 1px;
  width:600px;
  margin: 0 auto;
  height:auto;
  padding:1em;
}
</style>
  <div id=pun>
asdasdasd<br /> <br />
asdasdasd<br /> <br />
  </div>