# Expand width of sign up form **URL:** \ **Category:** Get Help\ **Tags:** signup-prompt-new-experience, login-experience\ **Created:** [December 10, 2025, 11:26am UTC](https://community.auth0.com/t/expand-width-of-sign-up-form/195366 "2025-12-10T11:26:17Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![amanda.milberg](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/amanda.milberg/32/71807_2.png) [@amanda.milberg](https://community.auth0.com/u/amanda.milberg)\ **Post date:** [December 10, 2025, 11:26am UTC](https://community.auth0.com/t/expand-width-of-sign-up-form/195366/1 "2025-12-10T11:26:17Z")
I am trying to expand the width of my sign up form using custom CSS. I added custom css as outlined [here](https://support.auth0.com/center/s/article/Forms-Styling-can-I-make-the-form-wider) but my form does not look any wider. To be specific - my custom CSS is below: :root { --prompt-width: 800px; --form-max-width: 800px; } ---
**Author:** ![vlad.murarasu](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/vlad.murarasu/32/72793_2.png) [@vlad.murarasu](https://community.auth0.com/u/vlad.murarasu)\ **Post date:** [December 10, 2025, 1:52pm UTC](https://community.auth0.com/t/expand-width-of-sign-up-form/195366/3 "2025-12-10T13:52:30Z")
Hi @amanda.milberg, Welcome to the Auth0 Community! The problem is most likely related to **where** the custom CSS is being placed, or a minor **typo** in one of the variable names. To reliably override Universal Login variables, the CSS must be included within the **Page Template HTML** , not just the Custom CSS field. You can find more about it at [Customize Universal Login Page Templates](https://auth0.com/docs/customize/login-pages/universal-login/customize-templates). Could you please specify more clearly where you are entering this code, and what the corresponding HTML page is for us to use? Have a good one, Vlad