body {
    width: 100%;
    height: 100%;
    background-color: lightgray;
    padding: 0;
    margin: 0;

}

div.body {
    width: min(100vw, 800px);
    margin-left: max(0px, calc(50vw - 400px));
    background-color: white;
    padding: 10px;
    height: calc(100% - 20px);
}

div.header {
    padding-bottom: 10px;

}


img.logo {
    max-width: 300px;


}

div.content {

}