Changing the background to black

I usually browse during evening hours and I find myself squinting from the white background. Is there a way to go about this? Maybe a mode to change the theme? Or is there an extension for chrome??

Thanks in advance,
oatp

I'll give it a go!! Was thinking how reddit has that "reddit enhancement" thing specifically for reddit itself, wondering if that would be a viable option here too ^.^

YESSSSSSSSSSSSSSSSS!!!!!!! Thank you so much ^_^ !!