Adjusting Header Image Size in Responsive HTML Email

Is there a way to automatically resize the header image proportionally to fit the container when the screen size is reduced using media queries?

Current CSS Code:

@media only screen and (max-width: 660px) {
        table.container { width: 480px !important; }

        td.headline { padding: 5px 0px 0px 30px !important}
        td.headline h1 { font-size: 28px !important}

    }

    @media only screen and (max-width: 510px) {
        table.container { width: 320px !important; }



        td.headline { padding: 5px 0px 0px 30px !important; }
        td.headline h1 { font-size: 22px !important; text-align: center; }

    }

I have attempted different methods, such as inline styling and image replacement for smaller screens, but haven't achieved the desired result.

To get a better understanding, please refer to two screenshots of the newsletter:

Image 1 Normal Full-sized render Image 2 Render at 480px width

For those interested in diving into the code, here is the complete HTML structure:

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Reha-Com-Tech Newsletter</title>
    <style type="text/css">

    @media only screen and (max-width: 660px) {
        table.container { width: 480px !important; }

        td.headline { padding: 5px 0px 0px 30px !important}
        td.headline h1 { font-size: 28px !important}

    }

    @media only screen and (max-width: 510px) {
        table.container { width: 320px !important; }

        td.headline { padding: 5px 0px 0px 30px !important; }
        td.headline h1 { font-size: 22px !important; text-align: center; }

    }


    </style>
</head> 
<body bgcolor="#f5be3d">

    <table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#f5be3d">
        <tr>
            <td>
                <table class="container" width="1000" align="center" border="0" cellpadding="0" cellspacing="0">
                <tr>
                        <td valign="top" class="header" bgcolor="#ffffff" style="padding: 0px 0px 0px 0px"; border-left: 1px solid #dbc064; border-right: 1px solid #dbc064; border-top: 1px solid #dbc064;>
                        <a href="http://www.reha-com-tech.de/">
                        <img id="banner" src="images/header_large.jpg" alt="Reha-Com-Tech" style="max-width:100%; height: auto;" width="100%" height="auto"></a>
                        </td>
                </tr> 
               ... [trimmed for brevity] ...
        
</body>

htmlcssimagehtml-email

Answer №1

Instead of relying on @media rules, consider adjusting your code by using width: 100% for resizable or responsive blocks.

Here's an approach that has worked well for me:

First Step: HTML Structure

<!DOCTYPE html>
        <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1, minimal-ui">
        </head>
        <body style="
            max-width: 100%;
            margin-right: auto;
            margin-left: auto;
            overflow: hidden;
            text-rendering: optimizeLegibility;
            /* include any necessary styles here for the email body */
            ">

Consider adding inline styles to individual elements. This method has been beneficial for me and could work for you too. For example:

<h1 align="justify" style="font-size:18px; color: rgb(0,0,0); text-shadow: 2px 2px 4px rgb(108,108,108);">
....
<table rules="all" style="border-color: #999; width:95%; margin-right: 5px" cellpadding="5">

Second Step: PHP Mail Form Handler

If you are sending the email through PHP, ensure to include the following in the header section of your PHP script:

$headers  = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=utf-8' . "\r\n";
$headers .= "From: $your_name <$your_email>\r\n";
$headers .= "Reply-To: $your_name <$your_email>\r\n";

...

The mail function should be set up as follows:

mail ($to, $subject, $message, $headers, <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b39ed5cadcc6c1d6ded2dadff3cadcc6c1d7dcded2dadd9dd0dcde">[email protected]</a>');

In case you encounter difficulties with these setups, exploring options like MailChimp, a reputable third-party newsletter/email service, could be a viable solution.

I trust this information has been valuable to you! If so, please consider indicating this answer as helpful and/or accurate. Much appreciated!

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