JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    <div id="logo">
        <img src="#" alt="logo">
    </div>
    <nav>
        <ul>
            <li id="link1"><a href="#"><img src="#" alt=""; height="100"; width="100"></a>
            </li>
            <li id="link2"><a href="#"><img src="#"  alt=""; height="100"; width="100"></a>
            </li>
            <li id="link3"><a href="#"><img src="#"  alt=""; height="100"; width="100"></a>
            </li>
            <li id="link4"><a href="#"><img src="#" alt=""; height="100"; width="100"></a>
            </li>
        </ul>
    </nav>
</header>
<footer id="footer">Hello there!</footer>

CSS

body {
    text-align: center;
    background-color: #1A1A1A;
    background-image: url('#');
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    margin:0px;
}
#logo {
    background-color: rgba(53, 53, 53, 0.9);
    padding: 10px;
    position: relative;
    margin-right: auto;
    margin-left: auto;
    margin-bottom: 5px;
    height: 90px;
    -webkit-border-bottom-left-radius: 5px;
    -webkit-border-bottom-right-radius: 5px;
    -moz-border-bottom-left-radius: 5px;
    -moz-border-bottom-right-radius: 5px;
    -ms-border-bottom-left-radius: 5px;
    -ms-border-bottom-right-radius: 5px;
    -o-border-bottom-left-radius: 5px;
    -o-border-bottom-right-radius: 5px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}
nav {
    background-color: rgba(53, 53, 53, 0.9);
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -msborder-radius: 5px;
    -o-border-radius: 5px;
    border-radius: 5px;
    padding: 0px;
    position: relative;
    margin-right: 0;
    margin-left: 0;
}
ul {
    list-style: none;
    margin: 0;
    display: inline-block;
    position: relative;
}
li {
    display: inline-block;
    position: relative;
}
a {
    display: inline-block;
    text-decoration: none;
    height: 100px;
    width: 100px;
    position: relative;
    text-align: center;
}
#link1:hover {
    background-color: #727272;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}
#link1:active {
    background-color: #ba6a15;
}
#link2:hover {
    background-color: #727272;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}
#link2:active {
    background-color: #ba6a15;
}
#link3:hover {
    background-color: #727272;
    -webkit-transition: all 0.3s;
   ...