[a11y] Issue 4: Submit button has insufficient contrast (Participation Page)

[NewJerseyStyle]

Description:

The submit button on the participation page has insufficient color contrast. The measured contrast ratio is 3.26, which is below the WCAG 2 AA minimum contrast ratio of 4.5:1. This makes the button difficult to see for users with low vision.

Steps to Reproduce:

1. Navigate to the participation page (e.g. https://pol.is/4cvkai2ctw)
2. Inspect the submit button using a browser's developer tools or a color contrast analyzer.

Expected Behavior:

The submit button should have a contrast ratio of at least 4.5:1 with the background.

Actual Behavior:

The submit button has a contrast ratio of 3.26, failing WCAG 2 AA guidelines.

Component/Area: Participation page

Source: Auto evaluation

Affected Elements: button

[thomassth]

Should be fixed with #32