ArcGIS Map HTML Code no longer working

I had the code below which came from an ArcGIS Map that provided an html code. This map was embedded in my Squarespace site and working until today when the block just shows a blank/white screen. Any helps, live chat said to ask here? 

<style>.embed-container {position: relative; padding-bottom: 80%; height: 0; max-width: 100%;} .embed-container iframe, .embed-container object, .embed-container iframe{position: absolute; top: 0; left: 0; width: 100%; height: 100%;} small{position: absolute; z-index: 40; bottom: 0; margin-bottom: -15px;}</style><div class="embed-container"><iframe width="500" height="400" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" title="Indian Day Schools in Ontario" src="//www.arcgis.com/apps/Embed/index.html?webmap=1508bb18002245afa43f288861c68601&extent=-103.36,40.5333,-54.9323,58.6903&zoom=true&previewImage=false&scale=true&disable_scroll=true&theme=light"></iframe></div>

Hi there

I still can see the map like this, may you share your current page to get the issue?