fix: 3.2 Dynamic Attributes CodeSandbox demo code

[juroberttyb]

Description

This PR fixes the button text not turning red on odd counts by adding the missing CSS style in index.html and provides a new CodeSandbox link.

Changes

1, Updated CodeSandbox link
2, Added the missing .red style in index.html

.red {
    color: red;
}

Questions

1. What change does your PR introduce?

   • Bugfix
   • New Feature
   • Enhancement
   • Refactoring
   • Documentation Update
   • Other

2. Is this PR related to any open issues?

   • Yes (40)
   • No

[gbj]

Thanks — I have fixed this in the original sandbox.