https://jsfiddle.net/9wusdqrj/ https://stackoverflow.com/questions/37732915/how-to-connect-items-in-unordered-list-by-lines-using-html
https://jsfiddle.net/9wusdqrj/ https://stackoverflow.com/questions/37732915/how-to-connect-items-in-unordered-list-by-lines-using-html