Problem with css gradient

I have a problem whit the background of my survey form page, it’s just a gradient, but it appears over the page changing the color of all elements in the document, i don’t know why and I need help, thanks.

This is the link of the code in codepen: https://codepen.io/FacuBustamante/pen/gOaYqmg

Hello there.

I have moved your post to a more suitable sub-forum.

If you have a question about a specific challenge as it relates to your written code for that challenge, just click the Ask for Help button located on the challenge. It will create a new topic and include a link to the challenge also. You will still be able to ask any questions in the post before submitting it to the forum.

Thank you.

To answer your question:

It appears like that because you have set the form to have an opacity of less than 1. So, the background shines through.

Also, some things to note when using CodePen:

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Hope this helps