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>
bootstrap img thumbnail
<img src="..." alt="..." class="img-thumbnail">
bootstrap img src
<img src="..." class="rounded mx-auto d-block" alt="...">
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