bootstrap put button on one line

1<div class="container">
2  <div class="row">
3    <div class="col-12 col-md-6">
4       <form>
5        <button class="btn btn-primary btn-lg" type="submit" formaction="1klasse.html">1.klasse </button>
6       </form>
7    </div>
8    <div class="col-12 col-md-6">
9      <form>
10        <button class="btn btn-primary btn-lg" type="submit" formaction="1klasse.html">1.klasse </button>
11       </form>
12    </div>
13  </div>
14</div>
15