nav {
    height: 100%;
    width: 98%;
    overflow: visible;
}
nav > ul > li > a {
    border-radius: 4px 4px 0 0;
}

nav > ul > li:hover > ul > li > a {
   color: aqua;
    list-style-type: none;
    text-decoration: none;
    padding-left: 10px;
    padding-right: 10px;
}
ul a span {
    height: 7px;
    margin-top: 8px;
    text-indent: -5000px;
    overflow: hidden;
}