Issue Summary

The border of the form fields fails the minimum color contrast requirements.

Steps to Reproduce

1. Open the "Create pull request" page.
2. Navigate to the "Filter the tree/Search changes" in the Diff tab and activate it.
3. Navigate to the mentioned form fields.
4. Use the CCA testing tool to check the color contrast of the border of those checkboxes.
5. Observe that the color contrast between the input border and the adjacent color is insufficient.

Screenshot

Actual Results

The border of all the form fields such as "Filter the tree" and "Search changes" are present in the “Diff“ tab in the main content area fails the minimum color contrast requirements with its background color.
FG: #DDDFE5
BG: #FFFFFF
Contrast ratio: 1.3:1

As a result, low-vision users will find it difficult to distinguish the form controls that have insufficient contrast.

Expected Results

The mentioned border of the checkboxes should have a minimum contrast of 3:1 with the adjacent content. This helps low-vision users to easily identify the form field. The expected contrast ratio can be achieved by increasing the contrast of foreground color until it passes a contrast ratio of 3:1.

A color contrast analyzer can be downloaded from Color Contrast Checker - TPGi

Workaround

Currently, there is no known workaround for this behaviour. A workaround will be added here when available

Environment

MacBook Pro (16-inch, 2021)
macOs Sonoma 14.3
Chrome - Version 120.0.6099.109 (Official Build) (arm64)
Firefox- Version 92.0 (64-bit) 
Safari- Version 17.3 (19617.2.4.11.8)
JAWS- Version 2023
NVDA- Version 2021.2 
Voiceover - Version Latest