body {margin:0px}
a {text-decoration: none;}
#container {
    background-color: goldenrod;
    height: 100vh;
    display: flex; flex-flow: column nowrap;
    gap: 3px;
}
#title {
    font-size: 50px;
    text-align: center;
    background-color: blueviolet;
    padding: 7px;
}
#menu {
    background-color: turquoise;
    display: flex; flex-flow: row nowrap;
    justify-content: space-evenly;
    padding: 4px;
}
#container2 {
    flex: 1 1 auto;
    display: flex; flex-flow: row nowrap;
}
#sidebar {
    background-color: greenyellow;
    flex: 0 0 200px;
    padding: 1px
}
#main { flex: 1 1 auto;
    background-color: white;
    padding: 4px;
}