[Enhancement] apply basic Kirby styles to the new modal

[mark-drastrup]

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Describe the enhancement

After implementing the new modal as described in #2585, we should apply basic Kirby styles to it, so we can give it the same appearance as the current modal.

Checklist:

The following tasks should be carried out in sequence in order to follow the process of contributing correctly.

Refinement

• Request that the issue is UX refined; do not proceed until this is done.
• Request that the issue is tech refined; do not proceed until this is done.

Implementation

The contributor who wants to implement this issue should:

• Make sure you have read: "Before you get coding".
• Signal to others you are working on the issue by assigning yourself.
• Create a branch from the develop branch following our branch naming convention.
• Publish a WIP implementation to Github as a draft PR and ask for feedback.
• Make sure you have implemented tests following the guidelines in: "The good: Test".
• Update the cookbook with examples and showcases.

Review

Once the issue has been implemented and is ready for review:

• Do a self-review.
• Create a pull-request. If you created a draft PR during implementation you can just mark that as "ready for review".

[stale]

This issue has been automatically marked as stale because of no recent activity. It will be closed in 10 weeks if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been closed due to inactivity. Please open a new issue if it becomes relevant again.