how to put two words in a button on single line

1.group {
2  display: flex;
3  flex-direction: row;
4  border: 1px solid black;
5  max-width: 100px;
6}
7
8.group > div {
9  border: 1px solid green;
10  margin: 2px;
11}

1<div class="group">
2  <div>Mandatory Documents</div>
3  <div><button>Button</button></div>
4</div>
5<br>
6<div class="group">
7  <div>Mandatory Documents</div>
8  <div><button>Button</button></div>
9</div>