Header set Content-Security-Policy-Report-Only style-src 'self' 'nonce-%{UNIQUE_ID}e';

$var = $var1 * $var2; // $var1 e $var2 sempre mudam

$myUniqId = $_SERVER ['UNIQUE_ID'];

<div class="star_bar" nonce="' . $myUniqId . '" style="width:' . $var . 'px;">