I'm sure this can be done i just don't know where it is, i have had a look to see about it but i can't really see much about it. I have attached the notification what i am on about.
you can change it in app/locale/en_US/Mage_Newsletter.csv file. Remember you only change the second instance e.g
"Thank you for your subscription.","Thank you for the subscription."
You can edit that Message by changing in Mage_Newsletter.csv
file.
Path of CSV file: app/locale/en_US/Mage_Newsletter.csv
to apply css to message block here is the structure.
<ul class="messages">
<li class="success-msg">
<ul><li><span>Thank you for your subscription.</span></li></ul>
</li>
</ul>
to add custom css in magento refer this.
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@Jake basically it is message blok of magento. if you want to change the style of that it may be apply to all success message of your site. – Gopal Patel Oct 31 '16 at 11:32
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