changing font size and font of a custom message added after comment

You can use CSS, either in a separate CSS file like this:

.wpd-custom-text{
  color: #f44242;
  font-family: "Times New Roman", Times, serif;
  font-size: 15px;
  font-weight: 900;
}

or inline like this:

<div class="wpd-custom-text" style="color:#f44242; font-family: 'Arial', 'Helvetica', sans-serif; font-size: 15px; font-weight: 900;">the comment added here is by the author and my website doesn't have any take on this .. </div>

Depending on the web fonts available to your site, just change the font-family, font-size and font-weight values.

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