How to remove sidebar from register.php?

[cluster]

How can I remove the sidebar from register.php "Create Your Account" and set page width to 100%?
I want to remove sidebar which shows:
Already registered with us? If so, click the button below to login to our client area from where you can manage your account.

I have already added this hook but it does not work for register.php

<?php

// Cart Sidebar Removal / Resizing v8.1 Hook
// Written by brian!

function cart_remove_sidebars_hook($vars)
{	
	$validtemplates = array("");
	if ($vars['inShoppingCart'] && !in_array($vars['templatefile'],$validtemplates)) {
		$head_return = "<style>#order-standard_cart .cart-body { width:100% !important; }
		.cart-sidebar {display: none;}</style>";
		return $head_return;
	}
}
add_hook("ClientAreaHeaderOutput",1,"cart_remove_sidebars_hook");

 

[theozsnowman]

you need to specify what templates this is being hidden on:

for example to hide it on the domain register and domain transfer pages:

$validtemplates = array("domainregister", "domaintransfer"); // Define the array with valid templates here