Código do botão Inscreva-se do Youtube

http://www.followyourdreams.com.br/widget-youtube-com-video-e-botao-de-se-inscrever/

<center>
<iframe width="300" height="169" src="https://www.youtube.com/embed/Z8lVMbC4SBw" frameborder="0" allowfullscreen></iframe>
<div style="margin-top:15px;">
<script src="https://apis.google.com/js/platform.js"></script>
<div class="g-ytsubscribe" data-channelid="UCZ3pui7Hps1KPor7K4_wnrg" data-layout="full" data-count="default"></div>
</div></center>