thanks for the link you posted, it worked!
so what should I write in the url, I am using the appery.io website's development environment.
Can you please look into this question also: http://gsfn.us/t/4qzhi
how can I change the font size of the header?
How can I change the background color of a mobilecollapseblockheader in the collapsible UI-component? I am using the development environment of Appery.io.
Can you please look into my second comment?
What does ".." represents in your answer?