bootstrap button rounded border code example

Example 1: button radius bootstrap 4

<span class="border"></span>
<span class="border-top"></span>
<span class="border-right"></span>
<span class="border-bottom"></span>
<span class="border-left"></span>

Example 2: boostrap 4 button with no button and border

<Button type = "button" class = "btn btn-primary btn-lg"> Large button </ button>