2.4.13 Fail - focus style of footer news link

The 'Get News in Email' link in the footer has insufficient contrast between the focussed and unfocused styles.

<img width="210" alt="unfocused style" src="https://github.com/user-attachments/assets/b6608cd2-b015-4b49-ac04-cafb994b26c8">

<img width="210" alt="focussed style" src="https://github.com/user-attachments/assets/69e6393d-2064-417f-b59c-8d23c2ba1f97">
