Test Environment:
OS: Windows 11 version 25H2 (OS Build 26220.7523)
Browser: Edge (Version 144.0.3719.35)
URL: https://select2.org/getting-started/basic-usage#single-select-boxes

Pre-Requisites:
Setting > Accessibility > Contrast Themes > Aquatic/Desert/Dusk/Night Sky themes

User Impact:
Low‑vision users relying on High Contrast themes modes may struggle to identify or use the combo box because the dropdown icon is not clearly visible. This can make it difficult for them to understand that the control is interactive, slowing down navigation and task completion.

Repro Steps:

1. Open the URL: https://select2.org/getting-started/basic-usage#single-select-boxes in edge browser in windows.
2. Basic Usage page will appear.
3. Press tab key to navigate to the 'Combo box dropdown' controls.
4. Verify that In high contrast Aquatic/Desert/Dusk/Night Sky theme modes, combo box dropdown icon properly visible or not.

Actual Result:
In high contrast Aquatic/Desert/Dusk/Night Sky theme modes, combo box dropdown icon is not properly visible.

Refer Attachment:

1. In high contrast theme modes, combo box dropdown icon is not properly visible.png
2. In high contrast theme modes, combo box dropdown icon is not properly visible.mp4

https://github.com/user-attachments/assets/7fcdfb2a-d83b-4c85-afe3-a8f85ba8e217

Expected Result:
In high contrast Aquatic/Desert/Dusk/Night Sky theme modes, combo box dropdown icon should be properly visible.