How make middle div to fill space between floating elements?

Question

I have three div elements: left, middle and right. Left and right are fixed and floating. What I want is the middle div to fill the gap in between them.

Answer 1

I was able to replicate the issue and fix it using percentages instead of absolute values. Since you are looking for something flexible between the two elements this should work.

#left {
    width: 20%;
    float: left;
    background: #ccc;
}
#middle {
    width: 60%;
    float: left;
    display: block;
    background: #ffffd;
}
#right {
    width: 20%;
    float: right;
    background: #bbb;
} 

Here's a demo