nav ul {
    z-index: 1000;

    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #3c3c3c;

    width: 100%;
    top: 0;
    position: fixed;

    opacity: 100%;
    transition: opacity 0.5s;
}

nav.scrolled ul {
    opacity: 50%;
}

nav li {
    display: inline;
    float: left;
}

nav li a {
    color: whitesmoke;
    text-decoration: none;
    display: block;
    padding: 8px;
}

nav li a:hover {
    background-color: #63D5EB;
    color: black
}

nav li a.current:hover {
    background-color: #63D5EB;
    color: black
}

nav li a.current {
    color: #63D5EB;
}

nav li:last-child {
    float: right;
}