I have learned that it is adjusted via js/functions.js file in the theme folder.
code:
/**
* Adds a top margin to the footer if the sidebar widget area is higher
* than the rest of the page, to help the footer always visually clear
* the sidebar.
*/
$( function() {
if ( body.is( '.sidebar' ) ) {
var sidebar = $( '#secondary .widget-area' ),
secondary = ( 0 == sidebar.length ) ? -40 : sidebar.height(),
margin = $( '#tertiary .widget-area' ).height() - $( '#content' ).height() - secondary;
if ( margin > 0 && _window.innerWidth() > 999 )
$( '#colophon' ).css( 'margin-top', margin + 'px' );
}
} );
Now I tried to changed it via this js code but it doesn’t work. Any Ideas how to solve this for customized child themes?