body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; 
    line-height: 1.6; 
    color: #333333; 
    margin: 0; 
    padding: 0; 
    -webkit-text-size-adjust: 100%; 
    -ms-text-size-adjust: 100%; 
}
.container { 
    max-width: 600px; 
    margin: 0 auto; 
    padding: 20px; 
    background-color: #ffffff; 
}
.header { 
    text-align: center; 
    margin-bottom: 30px; 
}
.logo { 
    display: block; 
    margin: 0 auto 20px auto;
    border: 0;
    max-width: 150px;
    height: auto;
}
.coupon-code { 
    background-color: #f8f8f8; 
    padding: 15px; 
    text-align: center; 
    font-size: 24px; 
    font-weight: bold; 
    margin: 20px 0; 
    border: 2px dashed #dddddd;
}
.footer { 
    text-align: center; 
    margin-top: 30px; 
    padding-top: 20px;
    border-top: 1px solid #eeeeee;
    font-size: 12px; 
    color: #666666; 
}
a { 
    color: #0073aa; 
    text-decoration: underline; 
}