Twilight, Section 5: Input field of the core/search block are not visible

[alaminfirdows]

Description
Related #640

In the Twilight theme variation, section style 5 has a white background. The accent color #FFFFFF33, which is used as a border for the core/search block's input field, doesn’t appear clearly. Since the background of the elements is also white, the input fields are difficult to see.

Step-by-step reproduction instructions

1. Navigate to Appearance > Editor > Styles in your WordPress dashboard.
2. Select and enable the Twilight style variation.
3. Add a Group block, and apply Section Style 5 to it.
4. Inside this group, add a Search block.
5. Finally, view the section that includes the comments.

Expected behavior
Users should be able to select and use the form field easily.

Screenshots