Updated stylesheet for PHBP 2.3.0
Updated stylesheet for PHBP 2.3.0

* Browsers Tested: Chrome/Firefox/Opera (Windows), Safari/Chrome (macOS), Safari (iOS 9 & 10)
* Made block page more consistent between tested browsers
* Moved from Eric Meyer's CSS Reset to instead use normalize.css
* Changed html font size to better suit REM usage, and altered REM sizes accordingly
* Minimised usage of per-browser media queries
WaLLy3K/wally3k.github.io