<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<style type="text/css">
*{
margin: 0px;
padding: 0px;
}
.fondo{
background: #d0d9da;
width: 100%;
height: 100%;
}
</style>
<div class="fondo">
<div class="mail" style="margin: 0 auto;background: #fff; width: 900px; border: solid 1px #fff;">
<div class="text" style="font-family: Verdana, Geneva, sans-serif; font-size: 13px;">
<div style="margin-top: 20px; font-weight: bold; color: #b6b8ba;">