Hey there! Let's tackle your email template centering problem head-on. First off, table-align isn't a valid HTML attribute—that's likely why your centering attempts aren't working. Email clients have notoriously strict and inconsistent CSS support (looking at you, Outlook!), so we need to stick to reliable HTML attributes and inline styles for table-based layouts.

Here's a step-by-step fix tailored to your project:

1. Fix the Outer Container Table #

Your main container table needs proper centering and reset spacing. Use the align="center" HTML attribute (far more reliable than CSS margins in email clients) and set a fixed width with a max-width fallback for modern clients:

<table align="center" width="700" cellpadding="0" cellspacing="0" border="0" style="max-width:700px; background:#fff; border-radius:5px; margin:0 auto;">

2. Center All Content Cells #

Every piece of text, image, or content block should live inside a <td> element with inline text-align:center styling. Email clients often ignore external stylesheets, so inline styles are non-negotiable here.

For your header image:

<td style="text-align:center;">
  <img src="img/heder.jpg" alt="header image" style="max-width:100%;">
</td>

For your service description text:

<td style="text-align:center; font-size:12px; padding:20px 5px; color:#fff;">
  <b>usługi fotograficzne</b>: wywoływanie fotografii z każdego typu nośnika i klisz, renowacja, retusz zdjęć, fotografia okolicznosciowa, sesje fotograficzne studyjne i plenerowe, fotografia reklamowa i katalogowa, akcesoria foto, <br>ramki, albumy, kubki, koszulki, poduszki z Twoim projektem<br>
  <p><b>usługi poligraficzne:</b> ksero, bindowanie, drukowanie, skanowanie.</p>
</td>

3. Replace Flex Layout with Table Rows #

Flexbox is barely supported in most email clients, so your old .flexcontainer needs to be converted to a table row structure. Use a full-width table with multiple <td> elements for each section:

<table width="100%" cellpadding="0" cellspacing="0" border="0">
  <tr>
    <td style="text-align:center; padding:10px;">
      <img src="img/qr.svg" style="max-width:100%; min-width:45px;">
    </td>
    <td style="text-align:center; padding:10px;">
      <img src="img/logo.svg" style="max-width:80px; min-width:45px;">
    </td>
    <td style="text-align:center; padding:10px;">
      <!-- Empty QR placeholder -->
    </td>
    <td style="text-align:center; padding:10px;">
      <ul style="list-style:none; padding:0; margin:0;">
        <li style="margin-bottom:5px;">Email:<br>zorza.studio@gmail.com</li>
        <li>Tel. <b>697 625 645</b></li>
      </ul>
    </td>
  </tr>
</table>

4. Ditch Unreliable Units #

Units like vw won't render consistently across email clients. Swap them for fixed px values (e.g., replace font-size:3vw with font-size:24px) to ensure your text looks the same everywhere.

Key Email Template Best Practices #

• Always use inline styles for critical properties (alignment, colors, fonts)
• Rely on HTML attributes like align="center" for table positioning instead of CSS
• Avoid modern CSS features (flex, grid, viewport units) — stick to the tried-and-true table-tr-td structure
• Reset cellpadding and cellspacing to 0 on all tables to eliminate unwanted gaps

内容的提问来源于stack exchange，提问作者Jaro