body {
      background-image: url('bg.jpg');
      background-size: cover;
    }
    
    header {
      text-align: center;
    }
    
    .container {
  background-color: rgba(255,255,255,0.7);
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
width:55%;
max-height:80%;
overflow:auto;
padding:20px;
background-clip: padding-box;
border: 20px solid transparent;
border-image: url('whitelace.png') 17 round;
}

.main {
  text-align: justify;
  display: flex;
}