reduce untwanted footer area

hi there 

I added some custom code to my site and now there is a new black block below my footer. 

how can i get rid of this or what is causing this?
https://createyouronlinepresence.com/

thank you for your help!

Can you share the code you used?

well funny enough you see the code hidden under that black banner.
it is the code for the multi language function but seems like somethings wrong @tuanphan and I don't see why

<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/flag-icon-css/2.6.0/css/flag-icon.css">

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

    window.Squarespace.onInitialize(Y, function(){  
    /* SETUP MULTI-LANGUAGE */
    var defaultLanguage = 'en';
    var lang = location.pathname.split("/")[1];
    var defaultClass = 'lang-'+defaultLanguage+'';
    var itemParent = "nav [class*='collection'],nav [class*='folder'],nav [class*='index'],nav [class*='group']";
    if (lang == "" || lang.length > 2 ){
      var lang = defaultLanguage;
    }

    /* ADD LANGUAGE CLASSES */
    $('a[href="/"]').addClass('lang-'+defaultLanguage+'').parents(itemParent).addClass('lang-'+defaultLanguage+'');
    $('nav a:link:not([href^="http://"]):not([href^="https://"])').each(function () {
      var langType = $(this).attr('href').split("/")[1];
      var multiLanguageClass = 'multilanguage lang-' + langType + '';
      if (undefined !== langType && langType.length <= 2) {
        $(this).addClass(multiLanguageClass).parents(itemParent).addClass(multiLanguageClass);
      }
    });
    $('nav button').each(function () {
      var langTypeFolder = $(this).attr('data-controller-folder-toggle').split("/")[0];
      var multiLanguageClass = 'multilanguage lang-' + langTypeFolder + '';
      if (undefined !== langTypeFolder && langTypeFolder.length <= 2) {
        $(this).addClass(multiLanguageClass);
      }
    });

    /* HOMEPAGE-LOGO LINKS TO PROPER LANGUAGE HOMEPAGE */
    if (lang == "en") {
      $('a[href="/"]').attr("href", "/en/online-agency/");
    }

    /* ADD EXCLUSION NAV ITEMS */
    $('.exclude-me,.exclude-me a').addClass('exclude');
    $('.sqs-svg-icon--list a,.SocialLinks-link').addClass('exclude');

    /* REMOVE OTHER LANGUAGES AND KEEP EXCLUDED ITEMS */
    $('.multilanguage:not(".lang-'+lang+',.exclude")').remove();

    /* SETUP LANGUAGE SWITCHER */
    $('body').prepend('<div class="language"><a href="/en/online-agency" class="lang-en"><span class="flag-icon flag-icon-nz"></span></a> <a href="/de/online-agentur/" class="lang-de"><span class="flag-icon flag-icon-ch"></span></a></div>');

             }           

     /* HOMEPAGE-LOGO LINKS TO PROPER LANGUAGE HOMEPAGE */
    if (lang == "de") {
      $('a[href="/"]').attr("href", "/de/online-agentur/");
    }
    if (lang == "en") {
      $('a[href="/"]').attr("href", "/en/online-agency/");
    }

      
      /* SETUP URL REROUTE FOR MATCHING LANGUAGE PAGE */
       var pages = [
      {'de': '/de/', 'en': '/en/'},
      {'de': '/de/online-agentur', 'en': '/en/online-agency/'},
      {'de': '/de/prozess/', 'en': '/en/process/'},
      {'de': '/de/kueber-uns/', 'en': '/en/about/'},
      {'de': '/de/kontakt/', 'en': '/en/contact/'}
    ];
    
    $.each(pages, function(index, page_map){
          if (window.location.pathname === page_map[lang]){
                   if (lang === "de"){
                           $(".language a.lang-de").attr("href", page_map[lang]);
                        $(".language a.lang-en").attr("href", page_map['en']);
                   } else {
                           $(".language a.lang-en").attr("href", page_map[lang]);
                        $(".language a.lang-de").attr("href", page_map['de']);
                   }
          }
             })                                             
  
  });
  
</script>

edit your code to, I added open script tag

<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/flag-icon-css/2.6.0/css/flag-icon.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
    window.Squarespace.onInitialize(Y, function(){  
    /* SETUP MULTI-LANGUAGE */
    var defaultLanguage = 'en';
    var lang = location.pathname.split("/")[1];
    var defaultClass = 'lang-'+defaultLanguage+'';
    var itemParent = "nav [class*='collection'],nav [class*='folder'],nav [class*='index'],nav [class*='group']";
    if (lang == "" || lang.length > 2 ){
      var lang = defaultLanguage;
    }

    /* ADD LANGUAGE CLASSES */
    $('a[href="/"]').addClass('lang-'+defaultLanguage+'').parents(itemParent).addClass('lang-'+defaultLanguage+'');
    $('nav a:link:not([href^="http://"]):not([href^="https://"])').each(function () {
      var langType = $(this).attr('href').split("/")[1];
      var multiLanguageClass = 'multilanguage lang-' + langType + '';
      if (undefined !== langType && langType.length <= 2) {
        $(this).addClass(multiLanguageClass).parents(itemParent).addClass(multiLanguageClass);
      }
    });
    $('nav button').each(function () {
      var langTypeFolder = $(this).attr('data-controller-folder-toggle').split("/")[0];
      var multiLanguageClass = 'multilanguage lang-' + langTypeFolder + '';
      if (undefined !== langTypeFolder && langTypeFolder.length <= 2) {
        $(this).addClass(multiLanguageClass);
      }
    });

    /* HOMEPAGE-LOGO LINKS TO PROPER LANGUAGE HOMEPAGE */
    if (lang == "en") {
      $('a[href="/"]').attr("href", "/en/online-agency/");
    }

    /* ADD EXCLUSION NAV ITEMS */
    $('.exclude-me,.exclude-me a').addClass('exclude');
    $('.sqs-svg-icon--list a,.SocialLinks-link').addClass('exclude');

    /* REMOVE OTHER LANGUAGES AND KEEP EXCLUDED ITEMS */
    $('.multilanguage:not(".lang-'+lang+',.exclude")').remove();

    /* SETUP LANGUAGE SWITCHER */
    $('body').prepend('<div class="language"><a href="/en/online-agency" class="lang-en"><span class="flag-icon flag-icon-nz"></span></a> <a href="/de/online-agentur/" class="lang-de"><span class="flag-icon flag-icon-ch"></span></a></div>');

             }           

     /* HOMEPAGE-LOGO LINKS TO PROPER LANGUAGE HOMEPAGE */
    if (lang == "de") {
      $('a[href="/"]').attr("href", "/de/online-agentur/");
    }
    if (lang == "en") {
      $('a[href="/"]').attr("href", "/en/online-agency/");
    }

      
      /* SETUP URL REROUTE FOR MATCHING LANGUAGE PAGE */
       var pages = [
      {'de': '/de/', 'en': '/en/'},
      {'de': '/de/online-agentur', 'en': '/en/online-agency/'},
      {'de': '/de/prozess/', 'en': '/en/process/'},
      {'de': '/de/kueber-uns/', 'en': '/en/about/'},
      {'de': '/de/kontakt/', 'en': '/en/contact/'}
    ];
    
    $.each(pages, function(index, page_map){
          if (window.location.pathname === page_map[lang]){
                   if (lang === "de"){
                           $(".language a.lang-de").attr("href", page_map[lang]);
                        $(".language a.lang-en").attr("href", page_map['en']);
                   } else {
                           $(".language a.lang-en").attr("href", page_map[lang]);
                        $(".language a.lang-de").attr("href", page_map['de']);
                   }
          }
             })                                             
  
  });
  
</script>

thank you @tuanphan, the black block is gone but so are my language flags/switcher. getting closer 😃