Working a Responsive theme
I installed the Casual responsive Package which was a surprise -- I did not expect a Package. So what have missed? What should I have read first?
the principle is the same for both 5.6 and 5.7.
A package is just the mechanism to make the theme portable and installable on different concrete5 installations.
Sorry for being so dense...
Responsive means the columns in the page will automagically fold down for smaller screen sizes.
It will likely use media queries in the css to set breakpoints for different screen sizes such as mobile, table and desktop.
You can install any theme you like but be careful if you install a theme that offers a new 'starting point' and asks to remove your current content (if the site is already populated).
Some themes come with what are called starting points (exactly like the sample theme on a fresh install which has the various pages of sample content to flesh the site out for you).
I did make a mistake by installing the demo version of Concrete5 with theme pre-installed (though I have removed all pages but the Home page -- cannot do that, of course).
Thank you for your patience...