first post here!

Here is an issue which I can't seem to solve: I have a PNG image with a small blue triangle. It's an asset used for a website that I'm creating with a developer. The appearance of its blue is a bit off, just very slightly different from the same hex color that is put on items through CSS.

When inspecting the PNG in photoshop, sampling the blue gives me the exact same hex code as what is used in CSS, yet they look different while both viewing them in a browser. How come?

I should note I have a calibrated monitor and manage colors, but a hex code is a hex code, no matter what profile you're on. Switching profiles should not influence the hex code.