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I struggled to get a transparent background for my summary section. Can anyone help?

First time doing a challenge for Frontendmentor and it was quite an enjoyable journey. The difficult part for me was getting my javascript to work how I would normally do for my css. It still has some flaws in it such as when the user clicks submit and dismiss message the container now gets all squished even with the media queries. If anyone can tell me some better practices for my javascript that would be truly helpful. Thank you