<script>
( function( $ ) {
    $( document ).ready( function() {
        function setTopMargin() {
            if ( $( 'body' ).hasClass( 'page-id-5' ) ) {
                $height = 0;
                if ( $( '#wpadminbar' ).length ) {
                    $height = $height + $( '#wpadminbar' ).height();
                }
                $padding = parseInt( $( '#page-container' ).css( 'padding-top' ).slice( 0, -2 ) );
                $height = $height + $( '#main-header' ).height() + $( '#main-content' ).height() - $( '#main-footer' ).height() + $padding;
                $( '#main-footer' ).css( 'margin-top', 'calc(100vh - ' + $height + 'px)' );
            }
        }
        $( document ).ajaxSuccess( function() {
            setTopMargin()
        } );
    } );
} )( jQuery );
</script>