body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
}

#menu {
    background-color: #333;
    overflow: hidden;
}

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

#menu li {
    float: left;
}

#menu li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

#menu li a:hover {
    background-color: #ddd;
    color: black;
}

iframe {
    width: 100%;
    height: calc(100vh - 50px);
    border: none;
}