header {
    background-color: cyan;
    text-align: center;
    padding: 10px;
}

footer {
    background-color: cyan;
    text-align: center;
    padding: 8px;
    position: fixed;
    z-index: 1000;
    bottom: 0;
    left: 0;
    width: 100%;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    background-color: #333333;
    display: flex;
    flex-wrap: wrap;
}

nav ul li {
    position: relative; 
}

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

nav ul li a:hover {
    background-color: #111111;
}

nav li.dropdown a {
    cursor: default;
}

nav li.dropdown ul.dropdown-content {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: cadetblue;
    padding: 0;
    margin: 0;
    list-style: none;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.2s ease;
    min-width: 200px;
    border-radius: 0 0 4px 4px;
    z-index: 9999; 
    box-shadow: 0px 8px 16px rgba(0,0,0,0.2);
}

nav li.dropdown:hover ul.dropdown-content {
    visibility: visible;
    opacity: 1;
}

nav ul.dropdown-content li {
    width: 100%;
    float: none;
}

nav ul.dropdown-content li a {
    padding: 12px 16px;
    display: block;
    color: white;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

nav ul.dropdown-content li a:hover {
    background-color: #111111;
}

div.flex-container {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}

div.flex-container > * {
    margin: 10px;
    flex: 1;
    border: solid 1pt grey;
    border-radius: 10px;
    padding: 10px;
}

@media screen and (max-width: 600px) {
    div.flex-container, nav ul {
        flex-direction: column;
    }
    nav ul li {
        width: 100%;
    }
    nav li.dropdown ul.dropdown-content {
        position: relative;
        min-width: 100%;
    }
}

#img {
    text-align: center;
    margin-bottom: 60px; 
}

#img img {
    width: 20%;
    height: auto;
}