Hi @dwassner ,
css class - yes, add it to another file: assets → theme.scss.liquid (should be the same name as in my theme, I guess).
I won’t affect anything else if you use this class only on this piece of code.
Then, you should use another syntax:
*Shipping Billed After Checkout Click here For detail
(Sorry for not inserting the code, somehow on my phone adding the code syntax isn’t working)
Adding www still not working? Try testing another page on your site (just a test if it does the same or not). If yes, I guess there has to be something in the code causing this issue. And also use a random external link as well. Just to find out where the problem lies.