Edit front-page.php and remove the wrap from the code that creates front-page-1. It is at line 69. When you open the file in an editor, the code to change looks like this:
https://gist.github.com/vfontjr/c715891ddff9f91ab15014287533e0db#file-before_change-phpChange it to:
https://gist.github.com/vfontjr/c715891ddff9f91ab15014287533e0db#file-after_change-php