body{text-align: center;background: #f2f6f8;}
.img{position:absolute;z-index:10;}

#container{
    display:inline-block;
    width:600px; 
    height:500px;
    margin: 0 auto; 
    background: black; 
    position:center;
    border:5px solid black; 
    border-radius: 10px; 
    box-shadow: 0 5px 50px #333}



.button_position
  {
    position:absolute;
    top: 100px; 
    left:6px;

  }