improve subscriber page with adding css class

hi
thanks fo you great plugin eventualo !
to improve the styling could you add class in your code for the subscriber page ? like this:

alo-easymail-subscr-page.php

line 42

echo “<p>”.__(“Error during activation. Please check the activation link.”, “alo-easymail”).”</p>”;

with adding class=’msg_error’

echo “<p class=’msg_error’>”.__(“Error during activation. Please check the activation link.”, “alo-easymail”).”</p>”;

line 44

echo “<p>”.__(“Your subscription was successfully activated. You will receive the next newsletter. Thank you.”, “alo-easymail”).”</p>”;

with adding class=’msg_ok’

echo “<p class=’msg_ok’>”.__(“Your subscription was successfully activated. You will receive the next newsletter. Thank you.”, “alo-easymail”).”</p>”;

line 100

echo “<p>”.__(“Your subscription was successfully deleted. Bye bye.”, “alo-easymail”).”</p>”;

with adding class=’msg_ok’

echo “<p class=’msg_ok’>”.__(“Your subscription was successfully deleted. Bye bye.”, “alo-easymail”).”</p>”;

line 139

echo “<p>” . __(“Your subscription to mailing lists successfully updated”, “alo-easymail”) . “.</p>”;

with adding class=’msg_ok’

echo “<p class=’msg_ok’>” . __(“Your subscription to mailing lists successfully updated”, “alo-easymail”) . “.</p>”;

i hope you can enhance this,
i you say yes a have another topics on the same subject…

https://wordpress.org/plugins/alo-easymail/