img {
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
}

/* Dropdown nav menu */
#banner nav {
    overflow: visible;
}

#banner nav ul::after {
    content: '';
    display: table;
    clear: both;
}

#banner nav li.nav-dropdown {
    position: relative;
    float: left;
    display: block;
}

#banner nav li.nav-dropdown .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    list-style: none;
    margin: 0;
    padding: 0;
    min-width: 10rem;
    z-index: 100;
    background: #1d1d1d;
    box-shadow: 0 2px 6px rgba(0,0,0,0.4);
}

#banner nav li.nav-dropdown:hover .dropdown-menu,
#banner nav li.nav-dropdown:focus-within .dropdown-menu {
    display: block;
}

#banner nav li.nav-dropdown .dropdown-menu li {
    float: none;
    display: block;
    margin: 0;
}

#banner nav li.nav-dropdown .dropdown-menu li a:link,
#banner nav li.nav-dropdown .dropdown-menu li a:visited {
    display: block;
    padding: 0.4rem 0.8rem;
    white-space: nowrap;
}

#banner nav li.nav-dropdown .dropdown-menu li a:hover,
#banner nav li.nav-dropdown .dropdown-menu li a:active {
    background: #444;
}