JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header-box">

      <div class="slide-area">
         <img id="pic1" src="http://susannahpryce.esy.es/wp-content/themes/sue/pics/hq-1-optimized.jpg" />
         <img id="pic2" src="http://susannahpryce.esy.es/wp-content/themes/sue/pics/hq-2-optimized.jpg" />
         <img id="pic3" src="http://susannahpryce.esy.es/wp-content/themes/sue/pics/hq-3-optimized.jpg" />
         <img id="pic4" src="http://susannahpryce.esy.es/wp-content/themes/sue/pics/hq-4-optimized.jpg" />
      </div>

      <div class="slide-area_480">
      </div>

      <div class="slide-area_640">
      </div>

   </div>

CSS

body  .header-box {
    background-color: #fff;
    float: left;
    height: 500px;
    width: 100%;
}
body  .header-box .slide-area {
    margin: 0 9%;
}
body  .header-box .slide-area #pic1 {
    animation-delay: 3s;
    animation-duration: 5s;
    animation-iteration-count: infinite;
    animation-name: slide-fade;
    position: absolute;
    transition-timing-function: ease;
    z-index: 5;
}
body .header-box .slide-area #pic2 {
    animation-delay: 20s;
    animation-duration: 60s;
    animation-iteration-count: infinite;
    animation-name: slide-fade;
    position: absolute;
    transition-timing-function: ease;
    z-index: 4;
}
body  .header-box .slide-area #pic3 {
    animation-delay: 30s;
    animation-duration: 60s;
    animation-iteration-count: infinite;
    animation-name: slide-fade;
    position: absolute;
    transition-timing-function: ease;
    z-index: 3;
}
body  .header-box .slide-area #pic4 {
    position: relative;
    z-index: 2;
}
@keyframes slide-fade {
0% {
    opacity: 1;
}
5% {
    opacity: 0;
}
50% {
    opacity: 0;
}
55% {
    opacity: 1;
}
100% {
    opacity: 1;
}
}
body .main .menu-block {
    background-color: #beb9b8;
    border: 1px solid #fff;
    border-radius: 0 0 8px 8px;
    box-sizing: border-box;
    float: left;
    height: 50px;
    width: 100%;
}
body .main .menu-block ul {
    text-align: center;
}
body .main .menu-block ul li {
    background-color: #f0c3b7;
    border: 3px solid #fff;
    border-radius: 6px;
    float: left;
    margin: 6px 0 0 1%;
    max-height: 22px;
    padding: 3px 0 6px;
    width: 23.15%;
}
body .main .menu-block ul li a {
    display: block;
    font-family: Verdana,sans-serif;
    font-size: 19px;
    font-weight: bold;
    height: 100%;
    width: 100%;
}
body .main .menu-block ul li a:hover {
    color: #504d4c;
}
body .main .content {
    background-color: #fff;
    border: 4px solid #ab8381;
    box-sizing: border-box;
    float: left;
    margin-top: 10px;
    min-height: 500px;
   ...