score:6

Accepted answer
<a className='btn btn-default'>
  <span>This will be line 1</span>
  <span> followed by line 2</span>
</a>

@media only screen and (max-width: 30em) {
  .btn span { display: block }
}

score:0

input[type="submit"] {
   white-space: normal;
}

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