Untitled

<div class="bigContainer">

<div class="container" >

  <div class="content">

  </div>

</div>

</div>

.bigContainer{

  width:300px;

  height:300px;

  background-color:#f3f3f3;

  padding: 10px;

}

.container{

  background-color:white;

  padding: 10px;

  margin:auto;

    position:relative;

  width:30px;

  height:90px;

}

.content{

    background-color:blue;

  height:30px;n

  border:1px solid black;

}