Buttons: add justify-content: center

[anselmbradford]

If the width of the buttons is set by a parent container, such as is done in https://www.consumerfinance.gov/paying-for-college/your-financial-path-to-graduation/, then the button text will be left-aligned by default. This makes it so it is center aligned.

Changes

• Buttons: add justify-content: center

Testing

1. Visit the buttons preview page and inspect the buttons. Manually set their width to 100% and see that the text is centered in the button.

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