I've added a "Login" button to the navigation header that redirects students to the GITAM login page at https://login.gitam.edu/Login.aspx. The button opens in a new tab and maintains the same styling as the other navigation buttons. Once students login through GITAM's system, they can easily access your attendance calculator from the navigation menu.

I've added a helpful tooltip that appears when users hover over the Login button. The tooltip displays "Login with GITAM Web" to make it clear that clicking the button will redirect them to the official GITAM login page. This helps students understand the purpose of the button without any confusion.