completed the LESS stylesheet for mobile, tablet and desktop. Also made it so that the web page recognises the DEVICE it's being displayed on, not the browser - therefore the content will always be the size set for the device's pixels - e.g. it won't change to the mobile view if the user decides to make the desktop browser smaller - it stays as the desktop view and gets side-to-side scroll if the browser is made smaller.
added a new html page 'postion.html', to practise with positioning CSS - static, relative and absolute positioning.