html, body {
    font-size: 20px;
    margin: 0;
    padding: 0;
    height: 100%;
    background-color: whitesmoke;
}

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

header {
    display: flex;
    flex-direction: column;
    flex: 0.2;
    background-color: whitesmoke;
}

#nav-wrap {
    display: flex;
    flex-direction: column;
    flex: 1;
}

#main-content { 
    display: flex;
    flex-direction: column;
    flex: 1;
    justify-content: center;
}

#footer {
    margin-top: auto;
    align-items: center;
    text-align: center;
}