Can't modify padding & margin of Bootstrap form elements

I want to modify the padding and spacing of form elements by using an internal style sheet (for now...ultimately I will turn it into an external style sheet).  I can't get it to reduce the padding and spacing of the form elements.  See this page:

Any help would be much appreciated!
Bob SchneiderCo-OwnerAsked:
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M. TariqApplication DeveloperCommented:
Just add your style rules to the
<div class="form-group">

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of the required element [margin-bottom: 10px;] for example.
Bob SchneiderCo-OwnerAuthor Commented:
Hmmmm...didn't appear to work.  Maybe it's not padding or margin.  Maybe it's height.  Can I modify the height without losing the mobile responsiveness of it?
Chris StanyonWebDevCommented:
The size of the form inputs is set in a file called mbr-additional.css on line 646:

.form-control {
   min-height: 3.5em;

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Bob SchneiderCo-OwnerAuthor Commented:
Perfect.  Thank you!
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