CSS side by side div with Pixel and Percent widths

Question

I have two div's (side by side) inside a parent div, i want right div to occupy 100% of remaining space (i.e. 100% - 200px) and should always stay next to left div (not below left div):

<div id="wrapper" style="width: 100%;">
    <div id="left" style="background-color: Blue; height: 100px; float: left; width: 200px;"></div>
    <div id="right" style="background-color: Aqua; height: 100px; float: left; width: 100%;"></div>
    <div style="clear: both;"></div>
</div>

Answer 1

Since you have only one fixed width column, float it left and that is it. As for the second column, do not specify float and width; this makes sure it is 100% wide. But you must add a left margin; otherwise the second column will interfere with the floated column e.g.

• aqua background will appear behind blue background (turn off the blue background to see what I mean)
• if second column becomes taller than first one, additional content will start appearing below the first column.

<div id="wrapper">
    <div id="left" style="background-color: Blue; height: 100px; float: left; width: 200px;"></div>
    <div id="right" style="background-color: Aqua; height: 100px; margin-left: 200px;"></div>
    <div style="clear: both;"></div>
</div>