How can I change the color on my subscription submit page?

[benaturallb]

hello,

i am stephanie and i am new here.

I am having a problem in changing the color of the subscription page:

when someone subscribe, and them  clicks next, the submit page is still in purple while all my website is in aqua blue and I cannot change in the theme editor,

is there any other way to do that?

Below is the page that i cannot change

[beauxbreaux]

Hello,

What is your site URL? I can see if there is a simple way to target the background to change the color with some CSS code. 

[benaturallb]

Hello, thank you for you reply this is my website URL

https://83e5cd-2.myshopify.com/

[beauxbreaux]

I am trying to get to the subscription page but not sure if you have it live. I am having trouble finding it. If you have the direct link to that page that would be helpful. 

The image you showed is just from the customizer and shows a page with captcha and a yellowish background. Because this is in the customizer instead of in the browser I can't use that URL in your photo to find the page. I thought maybe it was a redirect after submitting the email in your Subscribe box but that just submitted my fake email and didn't do anything else. So just a bit confused on what page we are trying to edit.