html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

#divOuter {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    padding-top: 15px;
}

#divFooter {
    width: 100%;
    margin-top: auto;
}