body, html {
    width: 100%; height: 100%; margin: 0; padding: 0;
}
.container {display: flex; width: 100%; height: 100%; flex-direction: column; background-color: #ccc; overflow: hidden;}
.menu {background-color: #fff; }
.iframe { flex-grow: 1; border: none; margin: 0; padding: 0; }

.menu ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu li {
    float: left;
    border: 1px solid #bbb;
    border-bottom-width: 0;
    margin: 0;
    white-space: nowrap;
}

.menu a {
    text-decoration: none;
    display: block;
    background: #eee;
    padding: 0.24em 1em;
    color: #00c;
    width: 8em;
    text-align: center;
}

.menu a:hover {
    background: #ddf;
}

.menu .selected {
    border-color: black;
}

.menu .selected a {
    position: relative;
    top: 1px;
    background: white;
    color: black;
    font-weight: bold;
}