code-injection Can't remove header, code injection not working

Site URL: https://www.et3.media/satisfactionsurvey

Using the Camino template, trying to remove the header from a single page. Tried a common code injection in the header and it isn't working. I've tried another version of the code and it doesn't allow the page to load at all.

This doesn't work.

<style>
	header {
		display: none !important;
	}
<style>

Hi. With your template, use this code

<style>
  header#siteHeader {
    display: none;
}
</style>