ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: black;
}

li {
    float: left;
    width: 19%;
    text-align: center;
    border-left: 5px solid #bbb;
}

    li:first-child {
        border-left: none;
    }

    li a, .dropbtn {
        display: inline-block;
        color: white;
        text-align: center;
        text-decoration: none;
        border-bottom: 0px solid #555;
        line-height: 50px;
        vertical-align: middle;
    }

        li a:hover {
            background-color: red;
            width: 100%;
        }

    li.dropdown {
        display: block;
    }

.dropdown-content {
    display: none;
    position: absolute;
    background-color: green;
    width: 17%;
    /*min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);*/
}

    .dropdown-content a {
        text-decoration: none;
        display: block;
        text-align: center;
    }

        .dropdown-content a:hover {
            background-color: blue;
        }

.dropdown:hover .dropdown-content {
    display: block;
}