Bootstrap 3 daterangepicker not taking 100% width - css

Question

I'm using custom datepicker (https://github.com/eternicode/bootstrap-datepicker) inside my form (http://jsfiddle.net/Misiu/a3NV4/22/)
I would like that daterangepicker to take 100% width like all other form elements, but can't get that to work.
My only workaround was to use datepicker css for bootstrap 2. I should use these rules:
#import url('http://getbootstrap.com/dist/css/bootstrap.css');
#import url('http://eternicode.github.io/bootstrap-datepicker/bootstrap-datepicker/css/datepicker3.css');
but instead I'm using (there is missing 3 at end of second line):
#import url('http://getbootstrap.com/dist/css/bootstrap.css');
#import url('http://eternicode.github.io/bootstrap-datepicker/bootstrap-datepicker/css/datepicker.css');
this is what I get when I use bootstrap 3 css:
also on small screen inputs in picker don't have equal width:
I would like to switch entirely to bootstrap 3, but this tiny but is stopping me from doing so.

Answer 1

You could add the col-xs-12 class to your input-group. This will force the group to always be as wide as it's parent container.
<div class="form-group">
<label class="col-sm-3 control-label">Dates range</label>
<div class="col-sm-9">
<div class="input-daterange" id="datepicker">
<div class="input-group col-xs-12">
<input type="text" class="input-small form-control" name="start" />
<span class="input-group-addon">to</span>
<input type="text" class="input-small form-control" name="end" />
</div>
</div>
</div>
</div>
Updated Fiddle

Answer 2

The problem was datepicker custom .input-group-addon css.
.input-daterange .input-group-addon {
width: auto; /*remove this line*/
min-width: 16px;
padding: 4px 5px;
font-weight: normal;
line-height: 1.428571429;
text-align: center;
text-shadow: 0 1px 0 #fff;
vertical-align: middle;
background-color: #eeeeee;
border: solid #cccccc;
border-width: 1px 0;
margin-left: -5px;
margin-right: -5px;
}
after removing width: auto both bugs were fixed, please see: http://jsfiddle.net/Misiu/a3NV4/24/