nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
nav li {
    position: relative;
    list-style: none;
}
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    display: none;
    background: white;
    border: 1px solid #ccc;
    padding: 0;
    left: -40px;
}
.dropdown-menu li {
    padding: 5px 10px;
}
.dropdown-menu li a {
    text-decoration: none;
    color: black;
}
.dropdown-menu.show {
    display: block;
}