JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header">
	    <a href="#grp1">grp1</a>
	    <a href="#grp2">grp2</a>
	    <a href="#grp3">grp3</a>
	    <a href="#grp4">grp4</a>
</div>
<div id="main">
    <div id="content">
        <div class="pic-a" id="grp1"></div>
        <div class="pic-a"></div>
        <div class="pic-a"></div>
        <div class="pic-a"></div>
        <div class="pic-b"></div>
        <div class="pic-b" id="grp2"></div>
        <div class="pic-b"></div>
        <div class="pic-b" id="grp3"></div>
        <div class="pic-c"></div>
        <div class="pic-c"></div>
        <div class="pic-c"></div>
        <div class="pic-c"></div>
        <div class="pic-d"></div>
        <div class="pic-d" id="grp4"></div>
        <div class="pic-d"></div>
        <div class="pic-d"></div>
    </div>
</div>

CSS

body {
    margin: 146px 32px 146px 32px;
    background-color: #ffffff;
}

#header {
    background:#ffdddd;
    position:fixed;
    height:146px;
    margin:0 auto;
    white-space:nowrap;
    top:0;
    max-width:1206px;
    left:37px;
    right:37px;
    z-index:1000;
}

#header a {
    margin-right: 12px;
}

#main {
    margin:0 auto;
    max-width:1216px;
}

#content > div {
    margin: 0 5px 10px 5px;
    float: left;
    width: 294px;
    height: 441px;
}

.pic-a {
    background-color: #aaffaa;
}

.pic-b {
    background-color: #aaaaaa;
}

.pic-c {
    background-color: #aaaaff;
}

.pic-d {
    background-color: #777700;
}