Putting 'none' for background image makes the background pale purple

[gabmifre]

I love the dark purple that comes with the default background image, but having an image is too distracting. I put 'none' for the image option, but it makes the new background pale. I've tried messing with the css but can't figure out how to get a nice deep purple again on the background. It's totally different from the example with NO background in the README, which is what I want.

This is the background purple when the image is present:
RGB: 37 21 61

Here is what it's like for me without the background image:
RGB: 67 61 55

Any idea how I can get the first color background without a background image?
Thanks