.about_bg {
	background: url("../img/about_mobile.jpg") center center / cover no-repeat;
}

.film_bg {
	background: url("../img/film_mobile.jpg") center center / cover no-repeat; 
}

.about_btn {
	margin-bottom: 140px; 
	margin-left: auto; 
	margin-right: 70px;
}
.film_btn {
	margin-bottom: 100px; 
	margin-left: auto; 
	margin-right: 40px;
}

.about_html_bg {
	background: url("../img/about_bg.jpg") center center / cover no-repeat;
}

.displayNone {
	display: block;
}

@media (min-width:641px) { 
	.about_bg {
		background: url("../img/about.png") center center / cover no-repeat;
	}
	.film_bg {
		background: url("../img/film.jpg") center center / cover no-repeat; 
	}

	.about_btn {
		margin-bottom: 140px; 
		margin-left: auto; 
		margin-right: max(180px, 9vw);
	}
	.film_btn {
		margin-bottom: 140px; 
		margin-left: 30px;
	}
	.displayNone {
		display: none;
	}
}