body, html {
    display: flex;
    margin: 0;
    height: 100%;
    flex-direction: column;
    font-family: "Segoe UI", 'sans-serif';
}
#main {
    flex: 1;
    display: flex;
}
#menyykiht{
    width: 300px;
    padding: 0px 20px 0px 20px;
    background: #eee;
}
#sisukiht{
    flex: 1;
    padding: 20px;
}
#jalusekiht{
    clear: left;
    text-align: center;
    border-top: 2px solid black;
    height: 100px;
}