/* 杀灭原理 */
.theory-content {
	max-width: 1200px;
	padding: 0 10px;
	margin: 0 auto;
}

.theory-content .introduce {
	color: #222222;
	text-align: center;
}

.theory-content .img {
	display: block;
	width: 100%;
	max-width: 100%;
}

@media screen and (max-width: 1023px) {
	.theory-content {
		padding: 40px 0 60px;
	}

	.theory-content .introduce {
		font-size: 18px;
		padding: 0 16px;
		margin-top: 40px;
	}
	
	.theory-content .img {
		margin-top: 20px;
	}
}

@media screen and (max-width: 500px) {
	.theory-content .introduce {
		font-size: 16px;
		margin-top: 30px;
	}
}

@media screen and (min-width: 1024px) {
	.theory-content {
		padding: 90px 10px 86px;
	}

	.theory-content .introduce {
		font-size: 24px;
		margin-top: 50px;
	}
	
	.theory-content .img {
		margin-top: 40px;
	}
}