Revive v4.1.4. | Banner 'Advanced' Tab | Save Problem

[paulzero]

Hi !

Trying to save the following in Revive-Adserver v4.1.4 > default manager > inventory > banners > banner > advanced (Tab) > "Always append the following
HTML code to this banner" :

<style type="text/css">
@media only screen and (min-width: 1px) and (max-width: 414px) {.show-ad-copy {display:block;}}
@media only screen and (min-width: 415px) and (max-width: 5000px) {.show-ad-copy {display:none;}}
</style>
<div class="show-ad-copy" style="margin: 3px 0px 0px 0px;">This is the ad copy to show on small screen only</div>

Above works fine in Revive-v3.2.0, but doesn't work in Revive-Adserver v4.1.4.

If you :

1) Try to 'save' you get a 'Error 403' message & no save.

2) If you remove the left brackets "(" & the right brackets ")" in 'style' it will save but obviously no use.

3) If you goto 'www/admin/banner-advanced.php L113' & change 'class='code' to anything else it saves but does not show on target website.

L113 | echo "<textarea class='code' name='append' rows='6' cols='55' style='width: 100%;'
tabindex='".($tabindex++)."'>".htmlspecialchars($banner['append'])."</textarea>";

Somewhere validation for class 'code' must have been changed - urgent help needed please to fix after upgrade, thank you. 

Cheers - Paulzero