/*通用类*/
.main {
	width: 1200px;
	margin: 0 auto;
}

.main img {
	width: 100%;
	display: block;
}
video{
	width: 100%;
}
@media only screen and (max-width:1200px) {
	.main {
		width: 1000px;
		margin: 0 auto;
	}
}

@media only screen and (max-width: 1000px) {
	.main {
		width: 800px;
		margin: 0 auto;
	}
}

@media only screen and (max-width: 750px) {
	.main {
		width: 100%;
		margin: 0 auto;
	}
	*{
		padding: 0;
		margin: 0;
	}
}