HTML Links not formatting the same across multiple clients in our footers

Hi, I'm wondering if people have styling code that can be added in to help with link formatting for our email footers. Currently our standard footer has 2 links and pulls in someone's email address using personalisation. In most clients the links aren't showing as underlined and the 2 links are the same colour and then the email address is a different colour. Also, In some clients the ABN is also changing to blue font and underlined when we don't want it to be. We want the 3 links to show in the same font colour and underlined on multiple different coloured backgrounds. Attached is a screenshot of one of the previews.