javascript - Body not set with correct content height -

i'm using object oriënted javascript , handlebars templating system. today discovered problem can't solve. when use templates, loaded after full dom structure, result window , body don't right height. concluding content cut off @ bottom of window , don't scrollbar. elements (divs, forms, ...) added via javascript. knows how solve issue?

the issue in css. ensure rule element should scroll bar not have line reads:

overflow: hidden; 

if change line

overflow: auto;