I realize the color palette might not be the most readable as I tried to use my "signature palette". Anyway I did check the contrast, and it passes the recommendations I found. If you can pin point a place where it does not, I'd be happy to fix it.
None of your header text or link text passes WCAG standards. So I don't know what recommendations you were looking at.
The colour of it (#4D644F on #090D1D) fails WCAG AAA at both large and small sizes.
The colour of every code tag (#6B7280 on #281234) also fails WCAG AAA and has readability reduced by having a contrasting edge against the background.
Your "last update" text at the problem is also lacking contrast.
That was just from glancing through (and copying numbers around). However, it is made worse by blue-light exposure reduction software (like that built in to Windows 10, Android and others, or provided by f.lux).