body { margin: 0px; 
    padding: 10px; 
    margin-left: auto; 
    margin-right: auto; 
    border-left: 1px solid #000; 
    border-right: 1px solid #000; 
    width:1000px; 
    border-bottom: 1px solid #000;

    background-image: url('bg.jpg');
        background-repeat: no-repeat;
background-attachment: fixed;
    background-size: 100vw 100vh;
 }
     
 center {
	background: rgba(255, 255, 255, 0.5);
}	
a {
    color:#000;
}