Email Notification template strips out html formating

Hi,

I've tried editing the HTML for ticket templates but it never seems to keep all the styling.....

For example in Visual Studio I created a very basic template:

What I received in the email for a new ticket notifcation though was :

In other tools like Spiceworks etc, copying basic html code from something like Visual Studio has worked flawlessly and the finished template is exactly what I designed.

But the HTML in the Freshservice product just doesn't play ball....

Has anyone had issues like this? Or can point me in the direction of a guide to how Freshservice HTML works in these ticket notifications?!

Thanks,

Scott.