What are materials that could give an atmosphere a deep blue color?

Here's some rough WIP pixel art of the planet I'm trying to create just to give you an idea of what I'm talking about color wise. I'm referencing the dark blue that you see at the poles of the planet.

This planet is going to be similar to Neptune in a lot of ways, a little smaller, about twice as massive, and also in the cold outer solar system, but I'm not sure if methane would be able to create the deep, dark blue color in the atmosphere that I'm looking for. Maybe nitrogen or oxygen or some compound with those? Or some completely different chemical?

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What are materials that could give an atmosphere a deep blue color?

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