Input to use available width

Below is my markup.
1 wrapper div which contains 2 left & right floating child divs.
First child div is floating left and it contains a label and an input.
The maximum width I can give to input is 50px.
Even if I can see some more space in that div.
How to utilise the empty space and extent input width to close to right floated div(in green)

[code=html]<div style=”height:20px;width:92px;background:red;margin:0px;padding:0px;font-size:11px;vertical-align:top “>
<div style=”width:68px;height:20px;float:left;vertical-align:top”>
<label>&#8364;&#8364;</label>
<input style=”width:50px;height:18px;font-size:11px;margin:0px;padding:0px;overflow:hidden;”/>
</div>
<div style=”width:12px;height:20px;float:right;background:green”>
</div>
</div>[/code]

Also in #CSS _↴