How to set bootstrap form-control padding to 0 px - css

Question

I have a problem with setting the Bootstrap form control padding to 0. I tried adding the .form-control class in styles but without success. I believe it should be possible to override some properties of CSS classes in the style block.
How do I set the .form-control padding to 0?
<wicket:head xmlns:wicket="http://wicket.apache.org/">
<styles>
.form-control {
padding: 0px;
}
</styles>
</wicket:head>
<wicket:panel xmlns="http://www.w3.org/1999/xhtml" xmlns:wicket="http://wicket.apache.org/">
<div class="col-xs-12">
<div class="col-xs-12">
<div class="form-group">
<div class="col-sm-3">
<input type="submit" value="Request" class="btn btn-danger"/>
</div>
<div class="col-sm-3">
<label for="quotationId" wicket:id="quotationIdLabel"></label>
<div>
<input wicket:id="quotationId" type="text" size="20"/>
</div>
</div>
<div class="col-sm-3">
<label for="product" wicket:id="productLabel"></label>
<div>
<select class="form-control" wicket:id="product"/>
</div>
</div>
<div class="col-sm-3">
<label for="contract" wicket:id="contractLabel"></label>
<div>
<input type="hidden" wicket:id="contract"/>
</div>
</div>
<div class="col-sm-3" style="padding: 0">
<label for="customer" wicket:id="customerLabel"></label>
<div>
<input class="form-control" type="hidden" wicket:id="customer"/>
</div>
</div>
<div class="col-sm-3">
<label for="serviceLevel" wicket:id="serviceLevelLabel"></label>
<div>
<select class="form-control" wicket:id="serviceLevel"/>
</div>
</div>
<div class="col-sm-3">
<label for="equipmentType" wicket:id="equipmentTypeLabel"></label>
<div>
<input class="form-control" type="hidden" wicket:id="equipmentType"/>
</div>
</div>
<div class="col-sm-3">
<label for="commodity" wicket:id="commodityLabel"></label>
<div>
<select class="form-control" wicket:id="commodity"/>
</div>
</div>
<span class="col-sm-3">
<label for="originCountry" wicket:id="originCountryLabel"></label>
<div>
<input type="hidden" style="display: inline-block;" wicket:id="originCountry"/>
</div>
</span>
<div class="col-sm-3">
<label for="originDgfStation" wicket:id="originDgfStationLabel"></label>
<div>
<input type="hidden" wicket:id="originDgfStation"/>
</div>
</div>
<div class="col-sm-3">
<label for="destinationCountry" wicket:id="destinationCountryLabel"></label>
<div>
<input type="hidden" wicket:id="destinationCountry"/>
</div>
</div>
<div class="col-sm-3">
<label for="destinationDgfStation" wicket:id="destinationDgfStationLabel"></label>
<div>
<input type="hidden" wicket:id="destinationDgfStation"/>
</div>
</div>
<div class="col-sm-3">
<label for="shippingTerms" wicket:id="shippingTermsLabel"></label>
<div>
<select class="form-control" wicket:id="shippingTerms"/>
</div>
</div>
</div>
<br/>
</div>
</div>
<div class="clearfix"></div>
</wicket:panel>

Answer 1

Add class "p-0" for 0 padding to the div you want,
class="other-class p-0"

Answer 2

Try more specific selector like this:
.form-group .form-control {
padding: 0;
}