From 6552691f7d8f979dd63f7721fc5baa3d870a17d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alberto=20Bl=C3=A1zquez?=
 <albertoblaz@users.noreply.github.com>
Date: Mon, 14 Jul 2025 14:36:34 +0200
Subject: [PATCH] Polish MultiSelectFilter appearance in Rules page (#227676)

## Summary

Polish inner border in `<MultiSelectFilter>` component, rendered upon
clicking on `<RulesTableHeader>` in the Rule page.

[Link to EuiSelectable
docs](https://eui.elastic.co/docs/components/forms/selection/selectable/#the-basics).

### Screenshots

<details><summary>Before</summary>
<img width="525" height="375" alt="Screenshot 2025-07-11 at 16 44 06"
src="https://github.com/user-attachments/assets/f100ce36-0450-476c-ba40-d7b4c34f5b50"
/>
<img width="502" height="363" alt="Screenshot 2025-07-11 at 16 44 17"
src="https://github.com/user-attachments/assets/7760c929-bf9c-4986-81ec-06f9604de109"
/>
</details>

<details><summary>After</summary>
<img width="515" height="338" alt="Screenshot 2025-07-11 at 16 43 25"
src="https://github.com/user-attachments/assets/b8a2e524-57cf-4bb6-a0f5-a47bfd17fd8e"
/>
<img width="491" height="345" alt="Screenshot 2025-07-11 at 16 43 34"
src="https://github.com/user-attachments/assets/26fc1bbf-f1a7-440c-a050-2f7f6ee59d01"
/>
</details>

### Checklist

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [x] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [x] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)
- [ ] Review the [backport
guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)
and apply applicable `backport:*` labels.

### Identify risks

Only risk is we're keeping style overrides in EUI components, which
should happen as little as possible. But the override enhances the
appearance when putting these components together, which is an edge
case.

(cherry picked from commit f9424c700cbc34c2b6d7885cc6863841c0af3c86)
---
 .../public/common/component/multi_select_filter.tsx             | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/x-pack/solutions/security/plugins/cloud_security_posture/public/common/component/multi_select_filter.tsx b/x-pack/solutions/security/plugins/cloud_security_posture/public/common/component/multi_select_filter.tsx
index fa78d705ed2cc..388bb30bb62c7 100644
--- a/x-pack/solutions/security/plugins/cloud_security_posture/public/common/component/multi_select_filter.tsx
+++ b/x-pack/solutions/security/plugins/cloud_security_posture/public/common/component/multi_select_filter.tsx
@@ -158,7 +158,7 @@ export const MultiSelectFilter = <T extends string, K extends string = string>({
             compressed: false,
             'data-test-subj': `${id}-search-input`,
             css: css`
-              border-radius: 0px !important;
+              box-shadow: none;
             `,
           }}
           emptyMessage={'empty'}