html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

#viewer {
    display: inline-block;
    width: 100%;
    height: 100%;
}

div#page {
    height: 100%;
    width: 100%;
}

section#region-main {
    float: none;
}

div[role='main'] {
    height: 100vh;
    margin: 0;
    padding: 0;
}