app/views/loan_request_mailer/send_email.html.erb
<!DOCTYPE html>
<html>
<head>
<meta content='text/html; charset=UTF-8' http-equiv='Content-Type' />
</head>
<body>
<h1>Hi, <%= @user.name %></h1>
<p>
Someone has sent you a loan request. Please take a look.
</p>
<p>
To login to the site, just follow this link: <%= @url %>.
</p>
<p>Thank you and have a great day!</p>
</body>
</html>