How to add padding in bootstap?

Question

css

<div class="container">
    <div class="row">
        <div class="col-sm tile">
            1
        </div>
        <div class="col-sm tile">
            2
        </div>
    </div>
    <div class="row">
        <div class="col-sm tile">
            3
        </div>
        <div class="col-sm tile">
            4
        </div>
    </div>
    <div class="row">
        <div class="col-sm tile">
            5
        </div>
    </div>
</div>

I have a table like this:
A A
B B C
How

can I add a 30px space between all the tiles in the table?