Creating a CSS grid layout with images - css

Question

I'm trying to make a nice grid layout using CSS but can't get them to display in rows of 3 with an individual column row of 33.3333%
The grid style I'm going for is this.
Here is the code I have so far;
HTML:
<section id="web">
<div class="row">
<span class="web large-3 columns"><img src="images/1.gif"></span>
<span class="web large-3 columns"><img src="images/2.jpg"></span>
<span class="web large-3 columns"><img src="images/3.png"></span>
</div>
<div class="row">
<span class="web large-3 columns"><img src="images/4.jpg"></span>
<span class="web large-3 columns"><img src="images/5.png"></span>
<span class="web large-3 columns"><img src="images/6.jpg"></span>
</div>
</section>
CSS:
section { display: block; }
section#web {
background: #f8f8f8;
padding: 80px 0;
}
.row {
width: 100%;
margin: 0 auto;
max-width: 1144px;
}
span.web {
margin-bottom: 20px;
text-align: center;
position: relative;
border: 1px solid #e3e3e3;
}
.row .large-3 {
position: relative;
width: 33.33333%;
}
.row .columns {
position: relative;
padding-left: .83333em;
padding-right: .83333em;
width: 100%;
float: left;
}
My JSFiddle.

Answer 1

You set the width as pixels. Instead, you should use percentages e.g width: 33%. And 33.3 for this layout is a bad choice as you applied 20px for margins. Maybe 28% would be fine.
The fiddle: http://jsfiddle.net/Vfffg/119/
.container > div {
margin: 20px;
width: 28%;
height: 100px;
background: blue;
float: left;
color: #fff;
text-align: center;
}