If you are using chrome (other browsers will have similar ways but picking chrome because popular)
a simple way (though it will make the site look kinda **** since I didn't bother to do it cleanly) is to install something like stylebot https://chrome.google.com/webstore/d.../related?hl=de

Then go to options and add a new style. Set "parahumans.wordpress.com" as url and it will be applied to all subsites. And add this code:

Code:
#page {background:#fff;}
body {    color: #000;}
All chapters should be display with black text and white text background.