Divs Not Acting Responsively in Browser

Question

Have 3 floated divs thatI have set to act responsively. It works fine in the live view of dreamweaver but not when testing in browsers. Here is a fiddle http://jsfiddle.net/pa5Ey/

CSS

#maincontentInner{
    max-width:1170px;
    position:relative;
    margin:0 auto;
    background-color:#FFF;
    overflow:hidden;
    border-right-width: 1px;
    border-left-width: 1px;
    border-right-style: solid;
    border-left-style: solid;
    border-right-color: #999999;
    border-left-color: #999999;
    padding-top:50px;
    }

.3col {
    width: 32.26%;
    margin-right:1.6%;
    float:left;
    text-align:center;
}

and the Markup

<div class="3col" style="margin-left:1.9%">
        Some Text Here<br />
        Some Text Here<br />
        Some Text Here<br />
        Some Text Here<br />
    </div>

    <div class="3col">
        Some Text Here<br />
        Some Text Here<br />
        Some Text Here<br />
        Some Text Here<br />
    </div>

    <div class="3col">
        Some Text Here<br />
        Some Text Here<br />
        Some Text Here<br />
        Some Text Here<br />
    </div>
    <div class="clearfix"/>

  </div><!-- End maincontentInner -->

Answer 1

CSS does not allow class names that begin with a number. The first character MUST be a letter.

Updated jsfiddle

.threecol {
    width: 32%;
    margin-right:1%;
    float:left;
    text-align:center;
}

Answer 2

Width and margin doesn't work with decimals So the right code will be:

.threecol {
    width: 32%;
    margin-right:1%;
}