Description

On mobile view, when clicking the hamburger menu, the close/back (X) button is not visible.

This makes it difficult for users to navigate back, affecting mobile usability.

Steps to Reproduce

1. Open the site in mobile view (https://c2si.org/)
2. Click on the hamburger menu
3. Observe that the close (X) button is not visible

Expected Behavior

The close (X) button should be clearly visible when the menu is open.

Screenshots