Yes, I encountered a similar issue. The solution may vary depending on your screen resolution. Try opening your developer tools in a separate window and resizing your main window to see if a horizontal bar appears at a specific resolution.
I decided to investigate further by using Chrome Devtools and examining different elements on the page. It became apparent that the upper right section was extending off the screen to the right and appeared wider than other elements.
https://i.sstatic.net/sS8j9.png
Upon closer inspection of the image named "hero.gif", I discovered that the width of the class "heroGif" was set to 55%:
https://i.sstatic.net/pvyOK.png
By manually adjusting the width to 50%, I was able to eliminate the scrollbar. However, this adjustment caused the aspect ratio of the image to become distorted (similar to when it was set at 55%). Remember that setting the width and height % for an image is based on the container size. If you only adjust one parameter, the aspect ratio will remain intact and the image will scale correctly. I would recommend keeping the height % and removing the width %. Keep in mind that this change could impact other areas where the same class is used, so thorough testing is necessary.