Equal Height Columns Width Issue

I have 3 columns that extend to equal height. The only problem now is that if I have 2 columns only they expand their width and take 100% of the main container. So basically I need

Solution 1:

Okay, finally here is my working jsFiddle demo. See http://jsfiddle.net/rfjg4/10/show/ for the result.

I added the class col2 to the second wrapper and the CSS:

.wrapper.col2:after {
    content: "";
    display: table-cell;
    width: 30.3%;
    margin: 015px3px;
    background-color: #fff;
    text-align: center;
    height: 100%;
    padding-bottom: 2px;
}

With the above code a new cell with empty content is added to the <div class="wrapper col2"> tag.

Alternatively you can avoid the col2 by using CSS 3 selectors:

wrapper:first-child:nth-last-child(3) ~ div::after {
    content: "";
    display: table-cell;
    width: 30.3%;
    margin: 015px3px;
    background-color: #fff;
    text-align: center;
    height: 100%;
    padding-bottom: 2px;
}

See this jsFiddle or http://jsfiddle.net/rfjg4/11/show/ for an example. (See this Stackoverflow question Can CSS detect the number of children an element has? for explanation of the selectors).

Some notes:

• In your jsFiddle example you used two times id="wrapper" for a <div>. You have to change the id to a class (and update your CSS)
• There is one </div> extra in line 17 (and in other lines, too). Those tags are marked red in jsFiddle.
• You do not need position:relative; in your CSS (I deleted it in the example).