custom options for styling sign in page using theme options

[muhaimincs]

Description 📓

Currently we have the theme options as follow

theme: {
    colorScheme: "auto",
    brandColor: "hsl(177 100% 30%)",
    logo: "./images/logo-dark.svg", // Absolute URL to image
    buttonText: "white",
},

Instead of writing custom sign in page, I want to be able to define border-radius, background color of login button for CredentialsProvider, etc

The purpose is to minimize the effort of customizing the sign in page by being able to define more properties on theme

How to reproduce ☕️

Nope

Contributing 🙌🏽

Yes, I am willing to help implement this feature in a PR