I am trying to construct a layout in my "app-view" div where the "leftPane" has a fixed with and the "rightPane's" width extends with the browser width (percentage). Is this possible with CSS (no Javascript)? Below are my basic styles for the layout in the div. 

```
#app-view
{
    width: 100%;
    height: 400px;
}

#leftPane
{
    float: left;
    width: 33.33%;
    max-width: 250px;
    height: 400px;
    background: blue;
}

#rightPane
{
    float: left;
    width: 66.66%;
    height: 400px;
    background: green;
}

```