* { font: 20px arial, sans-serif; }
body { margin:0; overflow:hidden; }
video { display:block; width: 100%; height: 100%; }
#prompt { display: none; position:fixed; top: 400px; left: 0; }
#gui_prompt { display: none; position:fixed; top: 300px; left: 0; }
#tilt_prompt { display:none; position:fixed; top: 200px; left: 0; }