Bootstrap buttons in one line

Buttons

Here is my code, and i dont know how to place the buttons side to side. (btw I'm new at coding)

<div class="second">
           <div class="col-md-12 text-center">
               <form>
            <button class="btn btn-primary btn-lg" type="submit" formaction="1klasse.html">1.klasse </button>
               </form>
           </div>
            <div class="col-md-8 text-center">
                <form>
                    <button class="btn btn-primary btn-lg" type="submit" formaction="1klasse.html">2.klasse </button>
                </form>
            </div>
        </div>