SOURCE

<div class="parent">
  <div class="son">
    wjewjre
    ewrwerwerwe
  </div>
</div>

*{margin:0;padding:0}
.parent{
  border:1px solid red;
 width:100%;
  height:100vh;
  box-sizing:border-box;
  display:flex;
  justify-content:center;
  align-items:center;
}
.son{
  width:100px;
  word-break:break-all;
  border:1px solid black;
  
  
}