JSFiddle - React, Tailwind, and code Playground

by SchmalzyB

HTML

<header>
    <div class="banner"></div>
    <div class="container">
        <ul class="nav">
            <li class="active"><a href="example.com">Home</a></li>
            <li><a href="example.com">About</a></li>
            <li><a href="example.com">Archive</a></li>
            <li><a href="example.com">Contact</a></li>
        </ul>
    </div>
</header>

CSS

.container {
    max-width: 38rem;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    margin-left: auto;
    margin-right: auto;
}
haeder {
  position: relative;
  padding-top: 50px;
}

.banner {
    position: absolute;
    top: 0;
    height: 80px;
    width: 100%;
    background-color: #ccc;
    z-index: -1;
}

.nav {
  list-style: none;  
   padding-top: 45px;
}

.nav > li{
    display: inline-block;
    position: relative;
}

.nav>li.active:after {
    content: "";
    position: absolute;
    top: 100%;
    width: 0px;
    height: 0px;
    border-top: 6px solid #ccc;
    border-right: 8px solid transparent;
    border-bottom: 8px solid transparent;
    border-left: 8px solid transparent;
    left: 50%;
    margin-left: -8px;
}