How can I change the color of the camera border in the editor?

I want to change the camera border color (and preferably width too), so that I can see the camera bounds better. It’s really hard for me to see with white on gray.
Here’s an image explaining what I want to do:

Thank you!

Use the OnDrawGizmos or OnDrawGizmosSelected method. You can change the color with Gizmos.color. As for the thickness, check answer to this question: Gizmos.DrawLine - thickens? - Questions & Answers - Unity Discussions

Sorry for the necro, but it looks like this is what I’m trying to do - I’m new to Unity so apologies if I’m missing something obvious.

I just need to change the camera bounding box color in the Editor, Scene Window. The near white lines don’t have enough contrast for my eyes, so I wanted to change the rectangle color to magenta.

Reading the reply from 2018, I figured I could just change the Gizmo color, attach the script to my MainCamera, and be done. However, it doesn’t seem to change the color of anything. I can see the script is being called (frequently) by adding a Debug.Log line.

So, any pointers on what I’m missing please?