I've created extremely simple form that contains 2 inputs and 2 buttons. When I would like my form to take 6 spans width and be centered.
Below is my code:
<div class="container-fluid padded">
<div class="row">
<div class="container">
<div class="row">
<!--filtry-->
<div class="span6 offset3 padded" style="border: 1px solid black;">
<form action="#" method="get" class="form-horizontal">
<fieldset>
<div class="control-group">
<label class="control-label">Data od</label>
<div class="controls">
<input type="text" id="dataOd" class="input-xlarge" />
</div>
</div>
<div class="control-group">
<label class="control-label">Data do</label>
<div class="controls">
<input type="text" id="dataDo" class="input-xlarge" />
</div>
</div>
<div class="form-actions">
<div class="pull-right">
<a class="btn wczytaj" href="#"><i class="icon-play icon-white"></i>Wczytaj</a>
<a class="btn btn-info disabled eksportuj" href="#" id="eksportuj"><i class="icon-download-alt icon-white"></i>Eksportuj</a>
</div>
</div>
</fieldset>
</form>
</div>
</div>
</div>
</div>
</div>
My form in full size browser looks like this:

but after resizing it I get this result:

How should I change my code to get those input 100% width on every resolution?
Is there any simple way or do I must tweak whole bootstrap?
I've tried adding span* classes to inputs but without any luck.
There are similar questions on SO (https://stackoverflow.com/a/11193864/965722), but answer involves JavaScript and I would like to avoid that.
Here is jsfiddle with my code: http://jsfiddle.net/Misiu/HdSEn/