Is There a Way to Fix Text In The Animate Stack?

In all my other non-animate stacks I can fix my text box so that no matter the size of the browser window a, let’s say, left justified text box using a simple mode of Fill, stays put. I have a form with a couple of headlines in an animate stack above it (separate stacks) that won’t stay anchored no matter what fill mode I try for both the stack and/or text container within it. The Foundation 2 column stack with the form fields, as expected, works fine (stack defined as Flexible with each field being filled. Any suggestions?