JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
    <div class="col-4">	<a class="thumb" href="#">
			<img src="http://fakeimg.pl/500x330/ccc/">
			<div class="caption"><span>Project title centered vertical and horizontal</span></div>
		</a>

    </div>
</div>

CSS

/************************************************
Site Name: 
Author: 
************************************************/
 html, body {
    margin: 0;
    padding: 0;
}
body {
    font-family: helvetica, arial, sans-serif;
    font-weight: normal;
    font-size: 100%;
    line-height: 1.4;
    color: #222;
    overflow-y: scroll;
    -webkit-font-smoothing: subpixel-antialiased;
    ;
    -moz-font-smoothing: subpixel-antialiased;
    ;
    font-smoothing: subpixel-antialiased;
    ;
}
:hover {
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
}
b, strong {
    font-weight: normal;
}
h1, nav {
    font-size: 1.9em;
    font-weight: normal;
    text-transform: uppercase;
    text-decoration: none;
    letter-spacing: 2px;
}
h1 {
    text-align: left;
    margin: 30px 0 30px 0;
}
h2 {
    font-size: 1em;
    font-weight: normal;
    text-transform: uppercase;
    text-decoration: none;
    letter-spacing: 1px;
    margin: 0;
}
p {
    font-size: 1.188em;
    margin: 0 0 20px 0;
}
h1 a, a:active, a:visited {
    color: #111;
    text-decoration: none;
}
h1 a:hover {
    color: #999;
    text-decoration: none;
}
p a, a:active, a:visited {
    color: #111;
    text-decoration: underline;
}
p a:hover {
    text-decoration: none;
}
/************************************************
Thumbnails - Columns - Content
************************************************/
 #container {
    display: block;
    margin: 110px 40px 100px 40px;
    overflow: hidden;
    background-color: transparent;
}
.content {
    margin: 0 auto;
    max-width: 1100px;
    overflow: hidden;
    display: -webkit-flex;
    -webkit-flex-flow: row wrap;
    display: -ms-flexbox;
    -ms-flex-flow: row wrap;
}
.content > div {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
.box1 {
    padding: 0 10px;
}
.box2 {
    padding: 0 40px;
}
.col-1, .col-2, .col-4,...