add image to boot strap button
<button class="btn btn-default">
<img src="http://i.stack.imgur.com/e2S63.png" width="20" /> Sign In with Facebook
</button>add image to boot strap button
<button class="btn btn-default">
<img src="http://i.stack.imgur.com/e2S63.png" width="20" /> Sign In with Facebook
</button>button with sign in image bootstrap 4
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<p class="mb-0">px-3:</p>
<a class="btn btn-lg px-3 btn-primary" href="#" role="button">USA <img src="https://lipis.github.io/flag-icon-css/flags/4x3/in.svg" height="30" alt="USA flag"></a>
<p class="mb-0">px-4:</p>
<a class="btn btn-lg px-4 btn-primary" href="#" role="button">USA <img src="https://lipis.github.io/flag-icon-css/flags/4x3/in.svg" height="30" alt="USA flag"></a>
<p class="mb-0">px-5:</p>
<a class="btn btn-lg px-5 btn-primary" href="#" role="button">USA <img src="https://lipis.github.io/flag-icon-css/flags/4x3/in.svg" height="30" alt="USA flag"></a>Copyright © 2021 Codeinu
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