Good presentation, and good topic! I went ahead and inspected your webpage, and it's throwing a 404 error on your marker icon reference; maybe check your pathing? There also might be an issue with one of your links being insecure; Github Pages will only let you use https links, which has tripped me up before, and it's throwing a warning in the inspect pane. Hope that helps you toward a solution!
Good presentation, and good topic! I went ahead and inspected your webpage, and it's throwing a 404 error on your marker icon reference; maybe check your pathing? There also might be an issue with one of your links being insecure; Github Pages will only let you use https links, which has tripped me up before, and it's throwing a warning in the inspect pane. Hope that helps you toward a solution!