blinded by web pages

[murm]

hello i didnt know where to post this so here is as good as anywhere.
i have a problem that everytime i open google or youtube i get blinded by the default white colour scheme is there an easy way to change these.

any help would be much appreciated.

 

[murm]

turn your monitor down?

would rather change the colour of the page to maybe black.
mainly on google

 

[murm]

Also: www.blackle.com

thanks for help blackle works fine. i spent ages configuring my new monitor didnt want to change settings again.