Problems with layers in the framework_html/css_WEB-ITnose

A frame has four layers: TOP, left, right, and bottom. How can we make the right automatically stretch when there is a lot of content, so that the entire page has a scroll bar and the bottom is pushed down;

Reply to the discussion (solution)

Define a relative value

Please provide detailed explanation, preferably with a code reference, thank you

Please solve it

This requires using js to dynamically obtain the height of the internal web page, and then setting the iframe notification