I have a code like this

add_action("gform_after_submission_3", "after_submission", 10, 2);
function after_submission($entry, $form){

$div_1 = $entry["6"]; // yes no
$div_2 = $entry["8"]; // yes no
......
enter code here
?>
<style>
        h1{ color: red; }
        tr.div td.lv_' . $div_lvl . '{ border: 4px solid #fd3c3d !important; }
    </style>
<h1>DEI Maturity Model</h1>
.....
<?php }

The HTML content gets displayed upon submission but the internal css I placed doesn't work. What am I missing here?