ul.nav {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

ul.nav li {
    float: left;
}

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

/* Change the link color to #111 (black) on hover */
ul.nav li a:hover {
    background-color: #111;
}

ul.nav li.home {
    background-color: green;
}

table {
    font-family: arial, sans-serif;
    border-collapse: collapse;
    width: 50%;
}

td,
th {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}

img {
    vertical-align: middle; /* | top | bottom */
    height: 20vh;
}

ul.video_list li {
    padding-top: 1%;
}

iframe {
    padding-top: 1%;
}