fix(compat): Add CSS tweaks for theme compatibility with Enfold

[mathetos]

User Story

As a Give user, I expect Give to look great out of the box with my Enfold theme.

Current Behavior

It currently breaks the line on the Top Amount area, and floating labels do not look awesome either.

Expected Behavior

I expect that the top amount will stay on one line, and that floating labels will be aligned properly as well.

Possible Solution

Adding some simple CSS tweaks to the theme-compatibility.scss file similar to how we do with default WordPress themes.

Steps to Reproduce

1. Install Enfold theme
2. View a single Give form and see how the amount breaks to the second line away from the currency symbol
3. See how floating labels aren't aligned well.

Visuals