app/views/report_mailer/daily.html.erb
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<style type="text/css">
body { margin: 0; padding: 0; background: #eeeeee; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; }
.title h1 { margin: 0; color: #999999; font-weight: normal; font-size: 25px; text-shadow: 0 1px 0 #ffffff; }
.report h3 { margin: 0; color: #444444; font-size: 16px; line-height: 24px; }
.report ul { margin-top: 5px; margin-bottom: 0; list-style-type: square; }
.report ul li { color: #888888; font-size: 14px; line-height: 20px; }
.data thead tr { background-color: #eef5fc; }
.data th { font-size: 14px; text-align: center; }
.data td { font-size: 13px; text-align: center; }
.data td.first { background-color: #ecedee; color: #666666; font-size: 11px; text-align: left; }
.list td { font-size: 13px; }
</style>
</head>
<body bgcolor="#eeeeee" topmargin="0" leftmargin="0" marginheight="0" marginwidth="0">
<table width="100%" cellpadding="0" cellspacing="0" border="0" bgcolor="#eeeeee">
<tr>
<td bgcolor="#eeeeee" width="100%">
<table width="600" cellpadding="0" cellspacing="0" border="0" align="center" class="main">
<tr><td><img border="0" src="<%= attachments["spacer.gif"].url %>" width="1" height="25"><br></td></tr>
<tr>
<td width="600" class="title">
<h1><%= @title %></h1>
</td>
</tr>
<tr><td><img border="0" src="<%= attachments["spacer.gif"].url %>" width="1" height="25"><br></td></tr>
<% @reports.each do |report| -%>
<tr>
<td bgcolor="#ffffff">
<table width="600" cellpadding="0" cellspacing="0" border="0" align="center">
<tr>
<td bgcolor="<%= report.color %>" nowrap><img border="0" src="<%= attachments["spacer.gif"].url %>" width="5" height="1"></td>
<td class="report">
<%= render partial: report.class.name.demodulize.underscore, locals:{report:report} %>
</td>
</tr>
</table>
</td>
</tr>
<tr><td><img border="0" src="<%= attachments["spacer.gif"].url %>" width="1" height="25"><br></td></tr>
<% end -%>
</table>
</td>
</tr>
</table>
</body>
</html>