I think you are asking how to create a response distance between the rows or col-xx-xx classes.
You can do this with the col-xx-offset-xx class:
<div class="col-xs-4"> </div> <div class="col-xs-7 col-xs-offset-1"> </div>
As for adding margin or padding directly to elements, there are some easy ways to do this depending on your element. You can use btn-lg or label-lg or well-lg . If you ever wondered how I can give this little pad. Try adding primary class name + lg or sm or md depending on your needs:
<button class="btn btn-success btn-lg btn-block">Big Button w/ Display: Block</button>
Supervetz
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