.maindesign .insert_container {
	margin: 50px 0;
}
.maindesign .material_container {
	width: 100%;
	margin: 30px 0;
}
.maindesign .material_container img,
.maindesign .material_container video{
	width: 100%;
	height: auto;
}
.maindesign #block {
	display: block;
	max-width: 860px;
	margin: 0 auto;
}
.maindesign .selective_address {
	margin-bottom: 30px;
}
.maindesign .flex_container {
	display: flex;
	justify-content: space-between;
	flex-wrap: wrap;
}
.maindesign .flex_container .material_container {
	width: 48%;
}
.maindesign .alone_container .material_container {
	max-width: 600px;
	margin: 0 auto;
}

@media screen and (max-width:767px) {
	.maindesign .insert_container {
		margin: 30px 0;
	}
	.maindesign .material_container {
		margin: 15px 0;
	}
	.maindesign .flex_container .material_container {
		width: 100%;
	}
}