How can I get three different designs for page.php?

To change the design with css, use the body_class: https://codex.www.ads-software.com/Function_Reference/body_class

you can create different designs with custom Page templates: https://codex.www.ads-software.com/Pages#Creating_Your_Own_Page_Templates

Thanks keeisiemeijer at the moment I have a very simple page.php so to use the custom page template I just save it as another name and then I can change the code? How can it be changed in the wp-admin? Thanks

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just save it as another name and then I can change the code?

yes

How can it be changed in the wp-admin?

On the edit Page screen you can give the page you’re editing or publishing your new template under “Page Attributes”

Thanks I’ll try it out ??

I saved a new design for a page and called it page2.php uploaded it to my theme. Then on the edit Page screen it can’t find the page in page attributes. I think I have to make the php page a design or something? Thanks

did you put the code in page2.php to make it a custom Page template:

<?php
/*
Template Name: page_two
*/
?>

https://codex.www.ads-software.com/Pages#Creating_Your_Own_Page_Templates

No! Have now and it works great thanks!

No problem. Glad you got it resolved.