app/views/devise/mailer/confirmation_instructions.html.inky
<container>
<row>
<columns>
<h4>Welcome <%= @resource.first_name || @resource.email %>!</h4>
<p>You can confirm your account email through the link below:</p>
<spacer size="16"></spacer>
<button href="<%= confirmation_url(@resource, confirmation_token: @token) %>">Confirm My Account</button>
</columns>
</row>
</container>