Resizeing af browsere

BODY      {
    font-family:"pnRegular","Helvetica Neue",Helvetica,Arial,sans-serif;
    font-size: 14pt;
    border: 0px solid #000000;
    background: transparent;
    background-color:#ffffff;
    scrollbar-face-color: #CCCCCC;
    scrollbar-shadow-color: #FFFFFF;
    scrollbar-highlight-color: #FFFFFF;
    scrollbar-3dlight-color: #FFFFFF;
    scrollbar-darkshadow-color: #FFFFFF;
    scrollbar-track-color: #FFFFFF;
    scrollbar-arrow-color: #000000;
}

@media (max-width:399px){
.main{width:100%}
}
@media (min-width:400px){
.main{width:800px;max-width:100%;}
}

<meta name="viewport" content="width=device-width, initial-scale=1">