html, body{
    height: 100%;
    text-align: center;
    /*font-size: 98%;*/
}

#header {
    display: flex;
    flex-direction: row;
    padding: 30px;
}

#logo {
    background-color: blue;
}

#nav {
    background-color: yellow;
}


body {
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
    height: 100%;
}

#sidebar {
    background-color: aquamarine;
}


#main-body {
    background-color: red;
    display: flex;
    flex-direction: row;
    overflow: auto;
}

footer{
    padding: 25px;
    background: darkslateblue;
    color: white;
}