html - Looking to figure out a way to scroll a lot of content while keeping the header and sidebar visible on Google Sites -

i created website on google sites , there appears no way have header , sidebar in fixed position. have lot of content on each page people need scroll through, i'd ideally figure out html code content area can have content scroll , not page can see header , sidebar.

i able find html scrollbar appears when you're scrolling through it, main page starts moving , doing whole bunch of wonky things.

is there simple coding put in it's easy scroll through content without having header , sidebar move?

i very, new coding , there's possibility question doesn't make sense. appreciated!!

you can set position:fixed;
hope helps demo