How to hide preheader text in sendgrid for all email application

Question

How to hide red box(that highlights in the image) preheader, for all applications like Gmail, outlook, etc.

I have tried adding an initial blank space and applying CSS to hide it in the mail body. using the below way working properly in Gmail, but some of the other applications not working like Mac mailbox, outlook

<tr class="m-hide" style="mso-hide: all;">
  <td style="font-size: 0pt; line-height: 0pt;">
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</tr>

Answer 1

I'd recommend using the following snippet from this blog post:

<span class="preheader" style="color: transparent; display: none; height: 0; 
max-height: 0; max-width: 0; opacity: 0; overflow: hidden; 
mso-hide: all; visibility: hidden; width: 0;">
  Insert preview text here :)
</span>