body {
    background-color: #dddddd;
    display: grid;
    grid-template-columns: 1fr 4fr 1fr;
    grid-template-rows: 1fr;
    grid-template-areas: 
        "docsel document sidebar";
    width: 100vw;
    height: 100vh;
    margin: 0%;
    position: fixed;
}

.docsel {
    grid-area: docsel;
    background: grey;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: repeat(6, 1fr);
}

.docsel .docbox{
    float: left;
    display: block;
    color: black;
    text-align: center;
    text-decoration: none;
    border-style: groove;
    border-color: black;
}

.docsel .docbox a:link, a:visited {
    background-color: grey;
    color: black;
    height: 100%;
    width: 100%;
    font-size: 30px;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    text-align: center;
    text-decoration: none;
    display: inline-block;
}

.docsel .docbox a:hover {
    color: white;
}

.document {
    grid-area: document;
    background: white; 
    overflow: hidden;
}

.document iframe {
    overflow: hidden;
    width: 100%;
    height: 100%;
    border-color: black;
    border-style: groove;
}

.sidebar {
    grid-area: sidebar;
}