How to assign space between two Divs using CSS in ASP.Net

I code a div just like below, but my problem is the spacing. how can I give them an space horizontally for a quarter of inch? 

<div class="container">
	<div class="row">
		<div class="col-sm-1">
			<i class="fa fa-id-card"></i>
        </div>
        <div class="col-sm-1">
			<i class="fa fa-id-card"></i>
        </div>
    </div>
</div>