Faça um div, CSS de tela cheia
height: 100vh
Diode
height: 100vh$('#toggle_fullscreen').on('click', function(){
// if already full screen; exit
// else go fullscreen
if (
document.fullscreenElement ||
document.webkitFullscreenElement ||
document.mozFullScreenElement ||
document.msFullscreenElement
) {
if (document.exitFullscreen) {
document.exitFullscreen();
} else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
} else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen();
} else if (document.msExitFullscreen) {
document.msExitFullscreen();
}
} else {
element = $('#container').get(0);
if (element.requestFullscreen) {
element.requestFullscreen();
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
} else if (element.msRequestFullscreen) {
element.msRequestFullscreen();
}
}
});