JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <a href="#enlace1.html">Enlace1</a>
    <a href="#enlace2.html">Enlace2</a>
    <a href="#enlace3.html">Enlace3</a>
    <a href="#enlace4.html">Enlace4</a>
    <a href="#enlace5.html">Enlace5</a>
</nav>
<!-- nav>a[href=enlace$.html]{Enlace$}*5 -->

CSS

nav {
    background: linear-gradient(#686868, #545454 50%, #464646 50%, #595959);
    border-spacing: 1px 0;
    border-radius: 5px;
    box-shadow: 0 4px 3px -3px black;
    display: table;
    overflow: hidden;
    width: 100%;
}
a {
    background: linear-gradient(#8b8b8b, #707070 50%, #5e5e5e 50%, #777777);
    color: white;
    display: table-cell;
    font: 13px Tahoma, Arial, sans-serif;
    line-height: 36px;
    text-align: center;
    text-decoration: none;
    text-shadow: 0px -1px 0px #333333;
}
a:hover {
    background-image:
        linear-gradient( 90deg, rgba(255,255,255,.1), transparent 10px),
        linear-gradient(270deg, rgba(255,255,255,.1), transparent 10px),
        linear-gradient(#5d5d5d, #424242 50%, #383838 50%, #535353)
    ;

}
a:before {
    background: linear-gradient(#9B9B9B, #868686 50%, #767676 50%, #8B8B8B);
    content : ' ';
    float: left;
    width: 1px;
}
a:after {
    background: linear-gradient(#959595, #7F7F7F 50%, #6E6E6E 50%, #848484);
    content : ' ';
    float: right;
    width: 1px;
}
a:hover:before, a:hover:after {
    background: none;
}